This happens to me almost daily. At some point, clicking run to run my flutter app just hangs. I always have to run Developer: Reload window to fix the issue. I opened the developer logs and saw this.

  ERR File is not being analyzed: Error: File is not being analyzed
	at handleResponse (/Users/kenzieschmoll/.vscode/extensions/dart-code.dart-code-3.61.20230324/out/dist/extension.js:29849:48)
	at processMessageQueue (/Users/kenzieschmoll/.vscode/extensions/dart-code.dart-code-3.61.20230324/out/dist/extension.js:29645:17)
	at Immediate.<anonymous> (/Users/kenzieschmoll/.vscode/extensions/dart-code.dart-code-3.61.20230324/out/dist/extension.js:29629:13)
	at process.processImmediate (node:internal/timers:466:21)