HTTP 400 "Invalid project resource name projects/" - All troubleshooting exhausted, need backend reset

Google Antigravity
1

Hi everyone,

I have been experiencing the persistent HTTP 400 “Invalid project resource name projects/” error on Antigravity for Windows. I have exhausted all common troubleshooting steps and need help, possibly a backend reset.

Error Details:

  • Trajectory ID: 31177c06-33c4-4094-938e-abf56267…
  • Error: HTTP 400 Bad Request
  • TraceID: 0x90bf0ccf93f4…
  • Message: “Invalid project resource name projects/” (the project ID field is empty)

My Configuration (verified):

  • OS: Windows 11 (Build 26200.8039)
  • Google Cloud Project: “Progetto Impresa 141125” (ID: gen-lang-client-0783663216, Number: 179975039034)
  • Project Organization: None
  • IAM Role: Owner
  • Gemini for Google Cloud API (cloudaicompanion): Enabled
  • Generative Language API: Enabled
  • 2FA: Enabled (since November 2025)
  • Quotas: No limits exceeded

Troubleshooting steps already attempted:

  1. Enabled 2FA on Google account
  2. Verified GCP project exists with correct APIs enabled
  3. Set GOOGLE_CLOUD_PROJECT environment variable
  4. Deleted ~/.antigravity and ~/.gemini configuration folders
  5. Reset onboarding via Ctrl+Shift+P
  6. Full reinstall of Antigravity
  7. Verified IAM permissions (Owner role)
  8. Verified no quota limits exceeded

Additional note:
The Google Auth Platform / OAuth Consent Screen on the project is not configured. Could this be contributing to the issue?

The error persists after every attempt. It appears the project ID is simply not being passed to the backend. I suspect this may require a manual backend reset or re-provisioning of my account.

Any help from the Google team would be greatly appreciated. Thank you.

2

it seems i have the same problem. i thought its my fault (still a high possibility), but after wasting hours with claude, the error seems to be something different.

i am having the very same problem as sebastiano_gadaleta does. thanks to claude, here is a better summary i could have ever done:

All agent requests fail with HTTP 400 Bad Request. The project ID is empty in the API request.

Error:

Trajectory ID: 47e9de86-f3a0-421e-be69-5526e82f...
Error: HTTP 400 Bad Request
TraceID: 0xb42f6a66b72c...
Message: "Invalid project resource name projects/"
Status: INVALID_ARGUMENT

Environment:

  • OS: Windows

  • Antigravity: latest version (fresh install)

  • Account: personal Gmail with 2FA enabled

What I’ve already tried:

  • Enabled 2-factor authentication

  • Created a project in Google Cloud Console

  • Complete uninstall and fresh reinstall

  • Deleted all config folders (%APPDATA%\Antigravity, %LOCALAPPDATA%\Antigravity, .gemini, .antigravity)

  • Selected “Fresh Start” during setup (no import from VS Code/Cursor)

  • Signed out and back in multiple times

  • Opened a completely empty folder as workspace

None of the above resolved the issue. The project ID remains empty in the API request. This appears to be a backend provisioning issue.

Thats why i request a backend reset as well. thanks :smiley:

edit: there is another much bigger thread already: Critical Bug: Persistent HTTP 400 "Invalid project resource name projects/" even after Gmail switch - #91 by paulot

3

I am having the same issues