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:
Enabled 2FA on Google account
Verified GCP project exists with correct APIs enabled
Set GOOGLE_CLOUD_PROJECT environment variable
Deleted ~/.antigravity and ~/.gemini configuration folders
Reset onboarding via Ctrl+Shift+P
Full reinstall of Antigravity
Verified IAM permissions (Owner role)
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.
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
I am experiencing the exact same HTTP 400 Invalid project resource name error after an email alias switch. I have cleared all local caches. Could a team member please perform a backend reset for my account?thank you
I upgraded to a google workspace, and doing that updated my email address to a domain name I also purchased. It seems those purchases broke my ongoing antigravity sub.. and to fix my antigrav sub, i need to undo / revert those purchases.. or wait for a dev to manually help. but Day 7 and i keep getting automated emails telling me to clear browser cookies for ANTIGRAVITY which doesn’t run in the browser.
