Fix: Python pathlib Not Working — Path Object Errors, Joins, and Common Pitfalls
How to fix Python pathlib issues — TypeError with string concatenation, path joining, glob patterns, reading files, cross-platform paths, and migrating from os.path.
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Fix: React Testing Library Not Finding Element — Unable to Find Role or Text
How to fix React Testing Library query failures — getByRole vs getByText, async queries, accessible names, waitFor patterns, custom queries, and common selector mistakes.
Fix: Spring Data JPA Query Not Working — @Query, Derived Methods, and N+1 Problems
How to fix Spring Data JPA query issues — JPQL vs native SQL, derived method naming, @Modifying for updates, pagination, projections, and LazyInitializationException.
Fix: Vite Proxy Not Working — API Requests Not Forwarded or 404/502 Errors
How to fix Vite dev server proxy issues — proxy configuration in vite.config.ts, path rewriting, WebSocket proxying, HTTPS targets, and common misconfigurations.
Fix: Vue Teleport Not Rendering — Content Not Appearing at Target Element
How to fix Vue Teleport not working — target element not found, SSR with Teleport, disabled prop, multiple Teleports to the same target, and timing issues.
Fix: Angular HTTP Interceptor Not Working — Requests Not Intercepted
How to fix Angular HTTP interceptors not triggering — provideHttpClient setup, functional interceptors, order of interceptors, excluding specific URLs, and error handling.
Fix: Angular Signals Not Updating — computed() and effect() Not Triggering
How to fix Angular Signals not updating — signal mutations, computed dependency tracking, effect() cleanup, toSignal() with Observables, and migrating from zone-based change detection.
Fix: Angular Standalone Component Error — Component is Not a Known Element
How to fix Angular standalone component errors — imports array, NgModule migration, RouterModule vs RouterLink, CommonModule replacement, and mixing standalone with module-based components.
Fix: AWS Lambda Environment Variable Not Set — undefined or Missing at Runtime
How to fix AWS Lambda environment variables not available — Lambda console config, CDK/SAM/Terraform setup, secrets from SSM Parameter Store, encrypted variables, and local testing.
Fix: AWS S3 CORS Error — Access to Fetch Blocked by CORS Policy
How to fix AWS S3 CORS errors — S3 bucket CORS configuration, pre-signed URL CORS, CloudFront CORS headers, OPTIONS preflight requests, and presigned POST uploads.
Fix: Tailwind CSS Classes Not Applying — Styles Missing in Production or Development
How to fix Tailwind CSS not applying styles — content config paths, JIT mode, dynamic class names, PostCSS setup, CDN vs build tool, and purging issues.
Fix: Docker Build ARG Not Available — ENV Variables Missing at Runtime
How to fix Docker ARG and ENV variable issues — build-time vs runtime scope, ARG before FROM, multi-stage build variable passing, secret handling, and .env file patterns.