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2026-05-19 csharp-14 csharp dotnet-10

Fix: C# 14 overload resolution breaking change with Span and ReadOnlySpan

After upgrading to C# 14 / .NET 10, calls like array.Contains, x.Reverse(), and MemoryMarshal.Cast suddenly bind to different overloads or stop compiling. Here is what changed and how to pin the old behaviour where it matters.

2026-05-18 github-copilot ai-agents openai

GPT-5.3-Codex Becomes the Copilot Business and Enterprise Base Model

On May 17, 2026 GitHub flipped the default Copilot model on Business and Enterprise plans from GPT-4.1 to GPT-5.3-Codex. GPT-4.1 stays free until June 1, then it falls under usage-based billing. Here is what changes for pinned models in your repo and CI.

2026-05-18 errors flutter android

Fix: AndroidX conflict during Flutter Android build

The fix in 30 seconds: set android.useAndroidX=true and android.enableJetifier=true in android/gradle.properties, then find any plugin still on the old support library and upgrade or replace it.

2026-05-18 errors csharp dotnet

Fix: framework_version=6.0.0 was not found when launching a .NET 6 binary

The .NET 6 runtime is gone or mismatched. Either install net6.0 again, roll forward to net8.0 via runtimeconfig, retarget the csproj, or ship self-contained.

2026-05-18 errors flutter android

Fix: Flutter background_fetch plugin requires minSdkVersion 21

The fix in 30 seconds: set minSdkVersion to 21 (or higher) in android/app/build.gradle. background_fetch is built on Android's JobScheduler, which only exists from API 21.

2026-05-18 errors ai-agents llm

Fix: rate_limit_error on Claude Sonnet 4.6 in a Long Agent Loop

A 429 rate_limit_error on claude-sonnet-4-6 in a long agent loop is almost always ITPM, not RPM. Read retry-after, cache the system prompt, and gate on anthropic-ratelimit-input-tokens-remaining. Step-by-step fix with code.

2026-05-17 mcp ai-agents dotnet

dotnet new mcpserver Now Ships in the .NET 11 Preview 4 SDK

.NET 11 Preview 4 bundles the mcpserver project template directly into the SDK. No separate Microsoft.McpServer.ProjectTemplates install, no preview feed dance. Pick stdio or HTTP transport, opt into Native AOT, and dotnet new mcpserver -o MyServer is the whole setup.

2026-05-17 errors ai-agents llm

Fix: Context Window Exceeded During an Aider Refactor

Aider 0.86 hit the token limit mid-refactor. The fix is /clear, /drop, --map-tokens, and switching to architect mode with Claude Sonnet 4.6's 1M window. Step-by-step repro, error breakdown, and config.

2026-05-17 errors flutter ios

Fix: Failed to build iOS app with Xcode 16 and Flutter 3.x

The fix in 60 seconds: upgrade Flutter to 3.24.4 or later, raise the Podfile platform to iOS 13, wipe Pods plus DerivedData, then pod install. The error rarely lives in your Dart code.

2026-05-17 errors dart flutter

Fix: Unhandled Exception: FormatException: Unexpected character when parsing JSON in Dart

The fix in 30 seconds: your response body is not the JSON you think it is. Print the raw bytes, decode with utf8.decode(response.bodyBytes), and never feed an HTML error page or a BOM-prefixed string to jsonDecode.