Developer Fixes Angular 21 Upgrade Failure Caused by Build Tool Version Mismatch

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A developer upgrading a project to Angular 21 encountered persistent module-not-found errors for packages like '@angular/material/chips' and '@angular/material/dialog'. The root cause turned out to be a version mismatch, where core Angular packages had been updated to version 21 but the build system was still running '@angular-devkit/build-angular' version 19. Because Angular's build tools are tightly coupled to the framework version, the outdated build pipeline generated misleading compiler errors. The issue was diagnosed using 'npm ls' and 'npm explain' commands, which revealed the project was resolving the older build package. The fix involved aligning all Angular packages to the same major version, then fully clearing node_modules, the package-lock file, and the npm cache before reinstalling dependencies.

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