errors

The version exists, but the pipeline cannot see it. Check the build identity's feed role, the feed view in the URL, which nuget.config the task uses, package source mapping, and the 30-minute HTTP cache.

flutter upgrade aborts if git status in the SDK folder prints anything. Inspect it, restore pubspec.lock or git stash -u, and use --force only as a last resort.

Code resolved a service from a DI scope or root provider after it was disposed. Capture IServiceScopeFactory instead of IServiceProvider and create a fresh scope where the work runs.

CS8618 is checked when the constructor exits, and [MemberNotNull] on a static method is silently ignored for instance members. Pass the values into a private constructor instead.

The Set-Cookie header is sent, but the browser rejects or never stores it. Fix SameSite=None without Secure, missing credentials: 'include' plus AllowCredentials, consent policy, and late Append calls.

EF Core never updates a key value on a tracked entity. Stop copying the key from DTOs, use a unique index instead of an alternate key, and change a real key by inserting a new row and deleting the old one. Tested on EF Core 10.0.14.

A plugin hook fails with "Failed to run: Plugin directory does not exist" when the directory your session loaded the plugin from is gone: an update past the 14-day orphan window, a claude.ai sync that moved the folder to .trash, or a --plugin-dir you moved. Run /reload-plugins, read its summary line, and know which cases need a restart. Checked against Claude Code 2.1.310.

Calling remove inside a for-in loop or forEach throws ConcurrentModificationError. Use removeWhere for in-place filtering, build a new list with where or a collection-for, or loop backwards by index. Verified on Dart 3.13.7, with a benchmark of why removeAt in a loop is the slow option.

Run /sandbox policy <command> to see what the sandbox blocked, then grant the path or host it needs, update Copilot CLI to 1.0.103 for the localhost, proxy and Linux fixes, and only bypass a command on purpose.

A claude -p run on Opus with an API key gives up after three consecutive 529s, about 1.5 seconds of backoff, no matter what CLAUDE_CODE_MAX_RETRIES says. Add --fallback-model, set CLAUDE_CODE_RETRY_WATCHDOG=1 with a max wait, or widen the 529 backoff with the OVERLOADED_RETRY delay variables. Checked against Claude Code 2.1.309.