Fix: ESLint Parsing error: Unexpected token (JSX, TypeScript, ES modules)
How to fix ESLint 'Parsing error: Unexpected token' for JSX, TypeScript, and ES module syntax by configuring the correct parser, parserOptions, and ESLint config format.
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api aws bash borrow-checker caching ci-cd cloud cors css curl database dependencies devops django dns docker eslint fetch flask frontend gcp git github github-actions go go-modules golang gradle hooks html infrastructure-as-code java javascript json jvm kubernetes linux localhost macos maven mongodb mongoose mysql networking nextjs nginx node-gyp nodejs npm ownership permissions php pip postgresql python react redis rust ssh ssl terraform typescript vite vscode webpack windows wsl yaml
Fix: CONFLICT (content): Merge conflict in file — fix conflicts and then commit the result
How to fix Git merge conflicts during merge, rebase, cherry-pick, and pull — resolve conflict markers, use merge tools, accept theirs or ours, abort, and prevent future conflicts.
Fix: ImportError: cannot import name 'X' from partially initialized module (circular import)
How to fix Python's circular import error: ImportError cannot import name from partially initialized module. Covers lazy imports, module restructuring, TYPE_CHECKING, Django, Flask, and more.
Fix: Docker no space left on device (build, pull, or run)
How to fix the 'no space left on device' error in Docker when building images, pulling layers, or running containers, with cleanup and prevention strategies.
Fix: CORS preflight request blocked — Response to preflight does not have HTTP ok status
How to fix 'Response to preflight request doesn't pass access control check' and 'preflight channel did not succeed' CORS errors by handling OPTIONS requests, setting correct headers, and configuring your server.
Fix: Module parse failed: Unexpected token (Webpack / Vite / esbuild)
How to fix 'Module parse failed: Unexpected token' in Webpack, Vite, and esbuild by configuring the correct loaders and transforms for JSX, TypeScript, CSS, JSON, and other file types.
Fix: Terraform Failed to install provider (or Failed to query available provider packages)
How to fix 'Failed to install provider' and 'Failed to query available provider packages' errors in Terraform, covering registry issues, version constraints, network problems, platform support, and air-gapped environments.
Fix: django.db.utils.OperationalError: no such table (SQLite / PostgreSQL / MySQL)
How to fix Django's 'OperationalError: no such table' error caused by missing migrations, wrong database configuration, corrupted files, or Docker volume issues.
Fix: EACCES: permission denied, mkdir / open / unlink (Node.js)
How to fix EACCES permission denied errors in Node.js for mkdir, open, unlink, and scandir operations, covering npm global installs, Docker, NVM, CI/CD, and filesystem permissions.
Fix: Hydration failed because the initial UI does not match what was rendered on the server (Next.js)
How to fix the Next.js hydration mismatch error. Covers invalid HTML nesting, browser extensions, Date/time differences, useEffect for client-only code, dynamic imports, suppressHydrationWarning, localStorage, third-party scripts, Math.random, auth state, and React portals.
Fix: MySQL ERROR 2002 (HY000): Can't connect to local MySQL server through socket
How to fix MySQL ERROR 2002 (HY000) when the MySQL client can't connect through the Unix socket file on Linux, macOS, Docker, and WSL.
Fix: java.lang.ClassNotFoundException (Class Not Found at Runtime)
How to fix Java ClassNotFoundException at runtime by resolving missing dependencies, classpath issues, Maven/Gradle configuration, JDBC drivers, classloader problems, and Java module system errors.
Fix: fatal: not a git repository (or any of the parent directories): .git
How to fix the 'fatal: not a git repository' error in Git by checking your working directory, initializing a repo, recovering a deleted .git folder, and resolving submodule, CI/CD, and IDE path issues.
Fix: ENOSPC: System limit for number of file watchers reached
How to fix the ENOSPC file watchers error on Linux by increasing the inotify watch limit, configuring VS Code, optimizing watched files, and handling Docker/WSL edge cases.
Fix: Kubernetes Pod CrashLoopBackOff (Back-off restarting failed container)
How to fix the Kubernetes CrashLoopBackOff error when a pod repeatedly crashes and Kubernetes keeps restarting it with increasing back-off delays.
Fix: npm ERR! code ELIFECYCLE (errno 1, Failed at script)
How to fix npm ERR! code ELIFECYCLE, npm ERR! errno 1, and npm ERR! Failed at the script errors. Covers reading the real error, node_modules corruption, node-gyp failures, wrong Node version, memory issues, postinstall failures, Windows-specific fixes, and more.
Fix: TS2322 Type 'X' is not assignable to type 'Y'
How to fix TypeScript error TS2322 'Type is not assignable to type'. Covers literal types vs general types, string vs String, union types, interface compatibility, generic constraints, readonly arrays, excess property checking, discriminated unions, type assertions, type widening and narrowing, React event handlers, Promise return types, and enum mismatches.
Fix: python: command not found (or python3: No such file or directory)
How to fix 'python: command not found', 'python3: command not found', and wrong Python version errors on Linux, macOS, Windows, and Docker. Covers PATH, symlinks, pyenv, update-alternatives, Homebrew, and more.
Fix: MongoServerError: bad auth / MongoNetworkError: connect ECONNREFUSED / MongooseServerSelectionError
How to fix MongoDB 'MongoServerError: bad auth Authentication failed', 'MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017', and 'MongooseServerSelectionError' connection errors. Covers MongoDB not running, connection string format, Atlas network access, Docker networking, authentication, DNS/SRV issues, TLS/SSL, and Mongoose options.
Fix: Error: Process completed with exit code 1 (GitHub Actions)
How to fix 'Process completed with exit code 1' and other GitHub Actions workflow failures. Covers reading logs, exit codes, Node.js/Python/Docker step failures, secrets and environment variables, GITHUB_TOKEN permissions, checkout issues, caching, timeouts, self-hosted runners, matrix strategy, and artifacts.
Fix: SyntaxError: Unexpected token < in JSON at position 0
How to fix 'Unexpected token in JSON at position 0', 'JSON.parse: unexpected character', and 'Unexpected end of JSON input' in JavaScript and TypeScript. Covers API returning HTML instead of JSON, Content-Type mismatches, fetch URL typos, invalid JSON syntax, BOM characters, CORS proxies, and debugging with response.text().
Fix: curl: (7) Failed to connect / (6) Could not resolve host / (28) Operation timed out
How to fix curl errors including 'Failed to connect to host', 'Could not resolve host', 'Operation timed out', and 'SSL certificate problem'. Covers curl exit codes 6, 7, 28, 35, 56, and 60, DNS resolution, proxy settings, timeout tuning, SSL issues, retry strategies, verbose debugging, and more.
Fix: Error Acquiring the State Lock (Terraform)
How to fix 'Error acquiring the state lock', 'Error locking state', 'Failed to load backend', and other common Terraform state and backend errors. Covers force-unlock, DynamoDB lock tables, S3 backend issues, state file corruption, and provider version conflicts.
Fix: WRONGTYPE Operation against a key holding the wrong kind of value (Redis)
How to fix Redis errors: WRONGTYPE Operation against a key holding the wrong kind of value, MISCONF Redis is configured to save RDB snapshots, OOM command not allowed, READONLY You can't write against a read only replica, and other common Redis errors. Covers key type mismatches, disk issues, memory limits, eviction policies, connection problems, and serialization.
Fix: Loading chunk failed / ChunkLoadError
How to fix 'Loading chunk failed', 'ChunkLoadError', and 'Failed to fetch dynamically imported module' in webpack, Next.js, React, and Vite. Covers stale deployments, CDN caching, publicPath misconfiguration, service worker cache, code splitting, dynamic import retry strategies, React.lazy error boundaries, and Next.js-specific solutions.
Fix: cannot borrow as mutable because it is also borrowed as immutable (Rust E0502, E0382, E0505)
How to fix Rust borrow checker errors including 'cannot borrow as mutable because it is also borrowed as immutable', 'use of moved value', 'value used here after move', E0382, E0502, and E0505. Covers ownership, borrowing, clone vs reference, Rc, Arc, RefCell, lifetime annotations, closure captures, and iterator ownership.
Fix: git stash pop – CONFLICT, local changes would be overwritten, no stash entries found
How to fix git stash errors: 'CONFLICT' after git stash pop, 'Your local changes to the following files would be overwritten', 'No stash entries found', and 'Could not restore untracked files from stash entry'. Covers stash pop vs apply, conflict resolution, recovering dropped stashes, and stashing untracked files.
Fix: TS2532 Object is possibly 'undefined' / Object is possibly 'null'
How to fix TypeScript errors TS2532 'Object is possibly undefined', TS18048 'Object is possibly undefined', and 'Object is possibly null'. Covers optional chaining, nullish coalescing, type narrowing, non-null assertion, type guards, strictNullChecks, Array.find, Map.get, React useRef, and more.
Fix: ERROR: Could not build wheels / Failed building wheel (pip)
How to fix pip 'ERROR: Could not build wheels', 'Failed building wheel', 'No matching distribution found', and 'error: subprocess-exited-with-error'. Covers missing C compilers, build tools, system libraries, Python version issues, pre-built wheels, and platform-specific fixes for Linux, macOS, and Windows.
Fix: SSL certificate problem: unable to get local issuer certificate
How to fix 'SSL certificate problem: unable to get local issuer certificate', 'CERT_HAS_EXPIRED', 'ERR_CERT_AUTHORITY_INVALID', and 'self signed certificate in certificate chain' errors in Git, curl, Node.js, Python, Docker, and more. Covers CA certificates, corporate proxies, Let's Encrypt, certificate chains, and self-signed certs.
Fix: bash: ./script.sh: Permission denied (Linux, macOS, WSL)
How to fix 'Permission denied' errors in bash, including chmod +x for scripts, file ownership with chown, EACCES in Node.js, Docker volume permissions, SELinux, ACLs, and WSL issues.
Fix: Too many re-renders. React limits the number of renders to prevent an infinite loop.
How to fix 'Too many re-renders' in React. Covers calling functions in JSX instead of passing references, setState in the render body, useEffect infinite loops, object/array dependency issues, and how to debug re-renders with React DevTools.
Fix: ERR_CONNECTION_REFUSED (localhost refused to connect)
How to fix 'ERR_CONNECTION_REFUSED', 'localhost refused to connect', and 'This site can't be reached' errors when accessing localhost in Chrome, Firefox, and Edge. Covers dev servers, port issues, 0.0.0.0 vs 127.0.0.1, Docker port mapping, WSL2, firewalls, and more.
Fix: java.lang.OutOfMemoryError: Java Heap Space / GC Overhead Limit Exceeded / Metaspace
How to fix Java OutOfMemoryError including 'Java heap space', 'GC overhead limit exceeded', 'Metaspace', and 'unable to create new native thread' with heap tuning, GC configuration, memory leak detection, and Docker container fixes.
Fix: YAML 'mapping values are not allowed here' and Other YAML Syntax Errors
How to fix 'mapping values are not allowed here', 'could not find expected :', 'did not find expected key', and other YAML indentation and syntax errors in Docker Compose, Kubernetes manifests, GitHub Actions, and config files.
Fix: no required module provides package / cannot find package in Go
How to fix 'no required module provides package', 'cannot find package', and 'module not found' errors in Go. Covers go mod init, go mod tidy, go get, GOPATH vs Go modules, GO111MODULE, GOPROXY, GOPRIVATE, replace directives, vendor directory, go.work workspaces, and major version suffixes.
Fix: Nginx 502 Bad Gateway
How to fix Nginx 502 Bad Gateway errors caused by upstream server issues, wrong proxy_pass configuration, PHP-FPM socket problems, timeout settings, SELinux, Docker networking, and more.
Fix: Docker Container Exited (137) OOMKilled / Killed Signal 9
How to fix Docker container 'Exited (137)', OOMKilled, and 'Killed' signal 9 errors caused by out-of-memory conditions in Docker, Docker Compose, and Kubernetes.
Fix: IndentationError: unexpected indent (Python)
How to fix Python's 'IndentationError: unexpected indent', 'IndentationError: expected an indented block', and 'TabError: inconsistent use of tabs and spaces in indentation'. Covers mixing tabs and spaces, editor settings, autopep8, black, and common copy-paste issues.
Fix: Access denied for user 'root'@'localhost' (MySQL ERROR 1045)
How to fix MySQL 'ERROR 1045 (28000): Access denied for user root@localhost (using password: YES/NO)' on Linux, macOS, Windows, and Docker. Covers password reset, auth plugin issues, skip-grant-tables recovery, MySQL 8 vs 5.7 differences, and host mismatches.
Fix: Module not found: Can't resolve / Cannot find module or its corresponding type declarations
How to fix 'Module not found: Can't resolve' in webpack, Vite, and React, and 'Cannot find module or its corresponding type declarations' in TypeScript. Covers missing packages, wrong import paths, case sensitivity, path aliases, node_modules corruption, monorepo hoisting, barrel files, and asset imports.
Fix: ssh: connect to host – Connection timed out / Connection refused / No route to host
How to fix SSH 'Connection timed out', 'Connection refused', and 'No route to host' errors. Covers firewall rules, SSH service, security groups, custom ports, VPN issues, bastion hosts, and sshd_config troubleshooting.
Fix: Unable to Locate Credentials (AWS CLI / SDK)
How to fix 'Unable to locate credentials', 'NoCredentialProviders: no valid providers in chain', and 'The security token included in the request is expired' errors in AWS CLI, SDKs, and applications running on EC2, ECS, Lambda, and Docker.
Fix: The Connection to the Server localhost:8080 Was Refused (kubectl)
How to fix 'the connection to the server localhost:8080 was refused' and other kubectl connection errors when the Kubernetes API server is unreachable.
Fix: psql: error: connection to server refused (PostgreSQL)
How to fix 'could not connect to server: Connection refused', 'psql: error: connection to server at localhost port 5432 failed', and other PostgreSQL connection refused errors on Linux, macOS, Windows, and Docker.
Fix: [vite] Internal server error: Failed to resolve import
How to fix Vite's 'Failed to resolve import' error, including 'Does the file exist?', 'Optimized dependency needs to be force included', 'Pre-transform error', and '504 (Outdated Optimize Dep)'. Covers missing packages, path aliases, optimizeDeps, cache clearing, and CJS/monorepo edge cases.
Fix: CSS z-index Not Working
How to fix z-index not working in CSS. Covers stacking contexts, position property requirement, parent stacking context limits, opacity and transform creating new stacking contexts, flexbox and grid z-index, and the isolation property.
Fix: Hydration failed because the initial UI does not match what was rendered on the server
How to fix Next.js and React hydration errors including 'Text content does not match server-rendered HTML', 'Expected server HTML to contain a matching <div> in <div>', and 'There was an error while hydrating'. Covers browser extensions, Date/time mismatches, invalid HTML nesting, window checks, localStorage, and third-party components.
Fix: error: externally-managed-environment (pip install)
How to fix the 'error: externally-managed-environment' and 'This environment is externally managed' error when running pip install on Python 3.11+ on Ubuntu, Debian, Fedora, and macOS.
Fix: You are in 'detached HEAD' state
How to fix Git's 'detached HEAD' state, 'HEAD detached at xxx', 'HEAD detached from xxx', and 'Warning: you are leaving X commits behind'. Covers creating a branch, saving commits, recovering lost work with reflog, and when detached HEAD is intentional.
Fix: Docker COPY Failed: File Not Found in Build Context
How to fix 'COPY failed: file not found in build context', 'failed to read dockerfile', 'failed to calculate checksum', and other Docker build errors caused by missing files.
Fix: TS2307 Cannot find module or its corresponding type declarations
How to fix TypeScript errors TS2304 'Cannot find name', TS2307 'Cannot find module or its corresponding type declarations', and TS7016 'Could not find a declaration file for module'. Covers @types packages, declaration files, tsconfig.json fixes, and global type declarations.
Fix: ENOSPC: System Limit for Number of File Watchers Reached
How to fix 'Error: ENOSPC: system limit for number of file watchers reached', 'ENOSPC: no space left on device, watch', and 'EMFILE, too many open files' in Node.js, VS Code, and other dev tools on Linux, macOS, and WSL2.
Fix: npm ERR! Missing script: "start"
How to fix "npm ERR! Missing script" for start, dev, build, and test. Covers adding scripts to package.json, common framework configurations for React, Next.js, Vite, Angular, Express, and Nest.js.
Fix: CONFLICT (content): Merge conflict in [file] – Automatic merge failed
How to fix Git merge conflicts: 'CONFLICT (content): Merge conflict in [file]', 'Automatic merge failed; fix conflicts and then commit the result', 'You have unmerged paths', and 'needs merge'. Covers manual resolution, VS Code, --theirs/--ours, merge --abort, mergetool, rebase conflicts, and prevention.
Fix: React Hook "useXxx" is called conditionally. React Hooks must be called in the exact same order in every component render.
How to fix 'React Hook is called conditionally', 'Rendered more hooks than during the previous render', 'Invalid hook call', and other React Hooks order errors. Covers conditional hooks, hooks in loops, hooks after early returns, duplicate React versions, and ESLint setup.
Fix: process.env.VARIABLE_NAME Is Undefined (Node.js, React, Next.js, Vite)
How to fix 'process.env.VARIABLE_NAME is undefined' and environment variables not loading from .env files in Node.js, React, Next.js, Vite, and Docker.
Fix: ModuleNotFoundError: No module named in Python
How to fix 'ModuleNotFoundError: No module named' and 'ImportError: No module named' in Python. Covers pip install, pip vs pip3, virtual environments, package name vs import name mismatches, PYTHONPATH, and IDE interpreter issues.
Fix: Port 3000 Is Already in Use (EADDRINUSE)
How to fix 'port 3000 is already in use', 'EADDRINUSE', and 'address already in use :::3000' errors in Node.js, React, Next.js, and other frameworks on macOS, Linux, and Windows.
Fix: fatal: not a git repository (or any of the parent directories): .git
How to fix the Git error 'fatal: not a git repository (or any of the parent directories): .git' when running git commands. Covers missing .git directory, wrong working directory, submodules, worktrees, and CI/CD environments.
Fix: Permission denied (publickey) – Git SSH Authentication Failed
How to fix 'git@github.com: Permission denied (publickey)' and 'fatal: Could not read from remote repository' when pushing or cloning over SSH. Covers key generation, ssh-agent, GitHub/GitLab setup, and edge cases.
Fix: npm ERR! ERESOLVE unable to resolve dependency tree
How to fix the ERESOLVE unable to resolve dependency tree error in npm. Covers root causes, peer dependency conflicts, --legacy-peer-deps, --force, npm overrides, and edge cases with React 18, TypeScript, and monorepos.
Fix: EACCES permission denied when installing npm packages globally
How to fix 'Error: EACCES: permission denied, access /usr/local/lib/node_modules' when running npm install -g on macOS or Linux. Multiple solutions ranked by recommendation.
Fix: TypeError: Cannot read properties of undefined (reading 'xxx')
How to fix 'TypeError: Cannot read properties of undefined', 'Cannot read property of undefined', and 'Cannot read properties of null' in JavaScript, TypeScript, and React. Covers optional chaining, async data fetching, destructuring, and nested object access.
Fix: git push rejected – non-fast-forward error
How to fix 'error: failed to push some refs' and '! [rejected] main -> main (non-fast-forward)' in Git. Covers pull, rebase, force push, and edge cases.
Fix: Error Cannot find module in Node.js (MODULE_NOT_FOUND)
How to fix 'Error: Cannot find module' and 'MODULE_NOT_FOUND' in Node.js. Covers missing packages, wrong import paths, node_modules issues, TypeScript moduleResolution, ESM vs CJS, and monorepo hoisting.
Fix: Access to fetch has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header
How to fix 'Access to fetch at ... from origin ... has been blocked by CORS policy: No Access-Control-Allow-Origin header is present on the requested resource' in JavaScript. Covers Express, Django, Flask, Spring Boot, ASP.NET, nginx, Apache, dev proxies, preflight requests, credentials, and edge cases.
Fix: fatal: refusing to merge unrelated histories
How to fix the Git error 'fatal: refusing to merge unrelated histories' when pulling, merging, or rebasing branches that don't share a common ancestor.
Fix: Docker Permission Denied While Trying to Connect to the Docker Daemon Socket
How to fix the 'permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock' error on Linux.