FIX: Antigravity IDE stuck on "Working..." indefinitely, instead of responding to the prompt

Google Antigravity
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1

If your prompts in Antigravity IDE suddenly get stuck on “Working…” forever, even for simple prompts like "hello" or "What is 2 + 2?", and the issue started after Antigravity had been working normally for days or weeks, check whether your antivirus has quarantined the language server executable.

Symptoms

  • Antigravity accepts prompts but never returns a response.

  • Clearing cache, logging out/in, restarting the IDE, or rebooting does not help.

  • Developer Console (Ctrl + Shift + P to open command pallette and select -Developer: Toggle Developer Tools) repeatedly shows:

(Antigravity IDE) [ERROR]:
LS update error:
Language server binary not found:
language_server_windows_x64.exe

Root Cause

In my case, Avast Free Antivirus quarantined the following file as IDP.Generic:

language_server_windows_x64.exe

Original location:

C:\Users\<username>\AppData\Local\Programs\Antigravity IDE\resources\app\extensions\antigravity\bin

Because this executable was removed, Antigravity’s language server could not start, causing all AI requests to remain indefinitely on “Working…”.

Solution

  1. Open Avast → Protection → Quarantine.

  2. Locate:

language_server_windows_x64.exe

  1. Click Restore.

  2. Add an Avast exception for:

C:\Users\<username>\AppData\Local\Programs\Antigravity IDE

(or at minimum, the ...\antigravity\bin folder).

  1. Completely close Antigravity IDE.

  2. Reopen the IDE.

Verification

After restoring the file, the following console error should disappear:

LS update error: Language server binary not found

Antigravity should immediately start responding to prompts again.

Additional Notes

The Avast detection name was:

IDP.Generic

which is often a false positive, especially for developer tools, Electron applications, and language servers. If you downloaded Antigravity from its official source, restoring the file and excluding the folder resolved the issue completely.