Fix: Certbot Certificate Renewal Failed (Let's Encrypt)
How to fix Certbot certificate renewal failures — domain validation errors, port 80 blocked, nginx config issues, permissions, and automating renewals with systemd or cron.
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711 articles — Page 34 of 60
Fix: Node.js Crashing with UnhandledPromiseRejection (--unhandled-rejections)
How to fix Node.js UnhandledPromiseRejectionWarning and process crashes — why unhandled promise rejections crash Node.js 15+, how to add global handlers, find the source of the rejection, and fix async error handling.
Fix: Poetry Dependency Conflict (SolverProblemError / No Solution Found)
How to fix Poetry dependency resolution errors — SolverProblemError when adding packages, conflicting version constraints, how to diagnose dependency trees, and workarounds for incompatible packages.
Fix: Python venv Using Wrong Python Version
How to fix Python virtual environments using the wrong Python version — venv picking system Python instead of pyenv, specifying the interpreter path, and verifying the active environment.
Fix: AWS ECR Authentication Failed (docker login and push Errors)
How to fix AWS ECR authentication errors — no basic auth credentials, token expired, permission denied on push, and how to authenticate correctly from CI/CD pipelines and local development.
Fix: Django Migration Conflict (Conflicting Migrations Cannot Be Applied)
How to fix Django migration conflicts — why multiple leaf migrations conflict, how to merge conflicting migrations, resolve dependency chains, and set up a team workflow to prevent migration conflicts.
Fix: Docker Build ARG Not Available in RUN Commands
How to fix Docker build ARG variables that are empty or undefined inside RUN commands — why ARG scope is limited, how ARG and ENV interact, multi-stage build ARG scoping, and secrets that shouldn't use ARG.
Fix: GitHub Actions if Condition Not Working (Steps and Jobs Being Skipped or Always Running)
How to fix GitHub Actions if conditions that don't evaluate correctly — why steps are skipped or always run, how to use context expressions, fix boolean checks, and handle job outputs in conditions.
Fix: GraphQL 400 Bad Request Error (Query Syntax and Variable Errors)
How to fix GraphQL 400 Bad Request errors — malformed query syntax, variable type mismatches, missing required fields, schema validation failures, and how to debug GraphQL errors from Apollo and fetch.
Fix: Kubernetes Ingress Not Working (404, 502, or Traffic Not Routing)
How to fix Kubernetes Ingress not routing traffic — why Ingress returns 404 or 502, how to configure annotations correctly, debug ingress-nginx and AWS ALB Ingress Controller, and verify backend service health.
Fix: Mongoose ValidationError — Document Failed to Save
How to fix Mongoose ValidationError when saving documents — required field errors, type cast failures, custom validator errors, and how to handle validation in Express APIs properly.
Fix: Next.js Middleware Not Running (middleware.ts Not Intercepting Requests)
How to fix Next.js middleware not executing — wrong file location, matcher config errors, middleware not intercepting API routes, and how to debug middleware execution in Next.js 13 and 14.