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Tag: errors

76 posts · Page 1 of 8

2026-07-21 errors csharp csharp-14

Fix: CS4014 "Because this call is not awaited, execution of the current method continues" in C#

CS4014 means you called a Task-returning method without awaiting it. Add await, or discard with _ = if fire-and-forget is truly intended, and handle exceptions.

2026-07-21 errors csharp dotnet

Fix: System.InvalidOperationException: Sequence contains no elements

This exception means you called .First() or .Single() on an empty sequence. Use FirstOrDefault/SingleOrDefault and null-check, or guard the query, or fix why the source is empty.

2026-07-20 errors csharp csharp-14

Fix: CS8618 "Non-nullable property must contain a non-null value when exiting constructor" in C#

CS8618 means a non-nullable field or property was not initialized by the time the constructor finished. Set it in the constructor, give it a default, mark it required, or make it nullable.

2026-07-20 errors mcp claude-code

Fix: MCP Server Throws "fetch is not defined" and EBADENGINE on Node.js Below 18

An MCP server on Node 16 warns EBADENGINE at install, then dies with 'fetch is not defined' on the first tool call. Upgrade to Node 18+ (20+ for the 2.x SDK) or polyfill the web globals.

2026-07-19 errors mcp claude-code

Fix: Claude Code misreads an MCP server's stderr startup message as an error

Claude Code logs every MCP server stderr line at [ERROR] and marks working servers as failed. If your tools still run, it is cosmetic. Here is how to confirm it and quiet the noise.

2026-07-18 errors flutter dart

Fix: ScaffoldMessenger.of() was called with a context that does not contain a Scaffold (Flutter)

This error means the BuildContext you passed is above the Scaffold or ScaffoldMessenger, not below it. Wrap the caller in a Builder, extract it into its own widget, or use a GlobalKey.

2026-07-18 errors dart flutter

Fix: type 'Null' is not a subtype of type 'X' in Dart

This runtime error means a null reached a cast expecting a non-nullable type, almost always from JSON. Make the field nullable, or supply a default before the cast runs.

2026-07-17 errors dotnet dotnet-11

Fix: "413 Request Entity Too Large" when uploading a file to an ASP.NET Core endpoint

Kestrel caps request bodies at 30,000,000 bytes by default and returns 413 when you exceed it. Raise MaxRequestBodySize globally, per endpoint, or in web.config behind IIS.

2026-07-17 errors mcp claude-code

Fix: all MCP servers fail to load after one malformed-JSON syntax error in the config

One trailing comma or unescaped Windows path in your MCP config makes every server vanish, not just the broken one. Validate the JSON, fix the five usual suspects, restart.

2026-07-17 errors csharp dotnet

Fix: System.InvalidOperationException: Headers are read-only, response has already started

You set a header, status code, or content type after the body was already flushed. Set all headers before the first write, or guard with HttpResponse.HasStarted and OnStarting.