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4200 Language server

A language server failed to start or crashed.

What it means

IntelliSense, go-to-definition, or diagnostics stopped because a language server exited or never started. Editing still works; language features may be limited.

What to do

  1. Re-open the file or the project folder.
  2. Check Settings → Features → Language Servers and confirm the server for this file type is enabled.
  3. For TypeScript/JavaScript, ensure node_modules (or your toolchain) is installed.
  4. Watch Output → LSP for the underlying message, then retry.

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