How to Fix Antigravity Sign-In and Account Errors

Account setup errors in Antigravity are some of the most frustrating obstacles you'll face. There are multiple steps in the flow—Google OAuth, project resource creation, configuration sync, and workspace initialization—and when something fails, it's not always obvious where the problem occurred. This guide walks you through the six most common sign-in and account errors, sorted by symptom, with step-by-step fixes.

The Antigravity Account Setup Flow

Understanding the process helps narrow down where things went wrong:

1. Google Authentication: OAuth sign-in with your Google account
2. Project Resource Creation: Antigravity server assigns a backend ID to your account
3. Configuration Sync: Local config files are created and synchronized
4. Workspace Initialization: The editor starts up and is ready to use

If any step fails, you hit an error. Let's go through each one.

Error 1: Infinite "Setting Up Your Account" Loading

What it looks like: You successfully signed in with Google, but the app now displays "Setting Up Your Account..." and nothing happens. The page just keeps loading.

Your Google authentication succeeded, but the backend either failed to create your project resource or can't sync your configuration. This is usually a connectivity or cookie issue.

Is It a Cookie Problem or a Server Problem?

Cookie problem if:

• Other web apps log you in fine with this browser, but Antigravity stays stuck
• A different browser logs in successfully, but this one doesn't

Server problem if:

• Every browser on every device gets stuck
• Other users reported successful sign-ups an hour ago

Diagnosis Steps

1. Open your browser's developer tools (F12 or Cmd+Option+I):

   • Click the Network tab
   • Enable the "Fetch/XHR" filter
   • Reload the page
   • Do you see any requests marked as "Failed" or with a red X?

2. Check HTTP status codes:

   ✅ 200 OK or 201 Created        → Server is responding normally
   ⚠️  401 Unauthorized             → Your auth token is invalid
   ❌ 500 Internal Server Error    → Server-side error (temporary)
   ❌ 503 Service Unavailable      → Server maintenance/overloaded
   

3. Check the browser console for errors:

   • F12 → Console tab
   • Any red error messages?
   • Copy the message and search for it

Fix Steps

Fix A: Clear Cookies and Cache (Success rate: 70%)

1. Close the Antigravity app completely

2. Clear browser cookies and cache:

   • Chrome: Settings → Privacy and Security → Clear Browsing Data
   • Safari: Preferences → Privacy → Manage All Website Data → Remove All
   • Firefox: Options → Privacy → Cookies and Cache → Clear Now

3. Try signing in again in an Incognito / Private window:

   • This window has zero cookies from prior sessions
   • If this works, go back to a normal window, clear cache again, and try once more

Fix B: Check Antigravity's Server Status (Success rate: 30%)

1. Visit the status page: status.antigravity.dev

2. Look for any incidents: Red 🔴 "Service Degradation" or "Incident" notices?

3. If there's an incident, wait for it to resolve (typically 30-60 minutes)

4. Test on a different device:

   • Try signing in on your phone with the same Google account
   • Try a different computer if you have one
   • If another device works, the problem is likely your PC's network or firewall

Fix C: Reset Your Account (Success rate: 60%)

1. Delete local Antigravity files:

   rm -rf ~/.antigravity
   rm -rf ~/.gemini

2. Restart Antigravity:

   • It will automatically recreate these directories
   • Go through the sign-in process again from scratch

Error 2: HTTP 429 "Too Many Requests"

What it looks like: You see an error message saying "Error 429" or "Too Many Requests" when trying to sign in.

Antigravity's server has rate-limited your IP address because it detected too many requests in a short time. This is a security feature to prevent abuse, but legitimate users can trigger it.

What Triggers This?

Multiple simultaneous sign-in attempts:

• Signing in on your phone, tablet, and laptop at the same time
• Refreshing the sign-in page multiple times in quick succession

Shared IP or VPN:

• Multiple people behind a corporate proxy
• Your VPN changes IPs with each connection, and each new IP looks like a new user

Diagnosis Steps

1. Check your current IP address:

   curl https://api.ipify.org?format=json

2. Verify no simultaneous sign-ins:

   • Close Antigravity on all devices except one
   • Close all browser tabs except the sign-in page

Fix Steps

Fix A: Wait 5-15 Minutes (Success rate: 99%)

Rate limits are temporary. In most cases, simply waiting solves the problem. The limit resets automatically.

1. Close Antigravity or the browser tab
2. Wait 15 minutes
3. Try signing in again

Fix B: Clean Cache and Sign In on One Device Only (Success rate: 90%)

1. Close Antigravity on all devices

2. On one device only:

   • Clear browser cookies and cache
   • Open an Incognito window
   • Try signing in
   • Wait for it to fully complete before opening Antigravity on other devices

Fix C: Disable Your VPN (Success rate: 80%)

1. Turn off any VPN you're using
2. Connect directly to your WiFi or mobile network
3. Try signing in
4. If it works, your VPN was the culprit. You can re-enable it afterward, but consider keeping it off during sign-in

Error 3: "Invalid Project Resource Name"

What it looks like: You log in with Google successfully, but then get an error saying "Invalid project resource name" or "Unable to initialize workspace."

The backend failed to generate your unique project resource ID. Without this, Antigravity can't create your configuration files.

Is This a One-Time Setup Failure or Account Corruption?

One-time setup failure if:

• This is your first time ever signing in
• The error appeared immediately after Google authentication

Account corruption if:

• You've signed in before and this just started happening
• The error happens on every sign-in attempt

Diagnosis Steps

1. Check your local config file:

   cat ~/.antigravity/account.json 2>/dev/null

   • Does the file exist?
   • Is it valid JSON? (Does it start with { and end with }?)
   • Does it have a project_resource_name field?

2. Check the browser console (F12 → Console):

   • Any errors mentioning "project" or "resource"?

Fix Steps

Fix A: Delete Local Config and Re-Initialize (Success rate: 85%)

# Remove all Antigravity configuration
rm -rf ~/.antigravity
rm -rf ~/.gemini
 
# Restart Antigravity
# The app will recreate these directories automatically

Fix B: Test with a Fresh Workspace (Success rate: 70%)

It's possible your project folder itself has corrupted data. Test with a brand new folder:

mkdir /tmp/antigravity_test
cd /tmp/antigravity_test
 
# Open this folder in Antigravity as a new workspace
# Run through the sign-in process again

If the new workspace succeeds, go back to your original project and delete its .antigravity/ and .gemini/ directories:

rm -rf /path/to/original/project/.antigravity
rm -rf /path/to/original/project/.gemini

Fix C: Verify Google Account Permissions (Success rate: 60%)

Antigravity needs certain Google account permissions to function.

1. Visit Google Account Security Settings
2. Look for "Third-party and connected apps"
3. Find Antigravity in the list. If it's not there, you may need to:
   • Go to the Antigravity sign-in page again
   • Click "Sign in with Google"
   • Explicitly grant permissions when prompted

Error 4: "This Account Is Not Registered"

What it looks like: You signed in with Google successfully, but Antigravity says "This account is not registered" or "We can't find your account information."

This usually means one of two things: (1) you're signing in with a different Google account than the one you originally used, or (2) your browser is blocking cookies needed for authentication.

Two Google Accounts?

If you use both Gmail (personal@gmail.com) and Google Workspace (work@company.com), or if you have Chrome profiles set up, you might be using the wrong account.

Browser Cookie Issues?

Some browsers (especially Safari) have strict privacy settings that block third-party cookies. Antigravity's sign-in relies on these.

Diagnosis Steps

1. Check which Google account is currently signed in:

   • Go to google.com
   • Click your profile icon in the top right
   • Note which email is displayed

2. Check your browser's cookie settings:

   • Chrome: Settings → Privacy and Security → Cookies → Is "Block third-party cookies" enabled?
   • Safari: Preferences → Privacy → Is "Prevent cross-site tracking" checked?

Fix Steps

Fix A: Sign Out Completely and Sign Back In With the Right Account (Success rate: 95%)

1. Sign out of Google:

   • Click your profile icon on google.com
   • Click "Sign out of all accounts"

2. Sign out of Antigravity:

   • Open the Antigravity app menu
   • Click Logout

3. Sign back in with your main Google account:

   • Go to google.com
   • Sign in with the email you actually use for Antigravity
   • Make sure it's the right one

4. Now sign into Antigravity:

   • Click "Sign in with Google"
   • Confirm the correct Google account is selected

Fix B: Use an Incognito / Private Window (Success rate: 80%)

These windows have zero cookies, which eliminates cookie-related issues:

Chrome  : Ctrl+Shift+N (Windows) / Cmd+Shift+N (Mac)
Safari  : Cmd+Shift+N
Firefox : Ctrl+Shift+P (Windows) / Cmd+Shift+P (Mac)

Try signing in here. If it works, return to a normal window, clear cookies again, and retry.

Fix C: Allow Third-Party Cookies (Success rate: 75%)

Antigravity's authentication needs third-party cookies:

1. Chrome: Settings → Privacy and Security → Cookies → "Allow all cookies"
2. Safari: Preferences → Privacy → Uncheck "Prevent cross-site tracking"
3. Retry sign-in

Error 5: "This Version Is No Longer Supported"

What it looks like: You get an error message saying "This version is no longer supported" or "Your Antigravity version might be outdated."

The Antigravity app or browser extension you're using is too old to talk to the current backend API.

Diagnosis Steps

1. Check your app version:

   • Antigravity menu → Help → About
   • Note the version number (e.g., 1.2.45)
   • Compare it against the latest release

2. Check your browser extension version:

   • Chrome: chrome://extensions → Look for Antigravity
   • Firefox: about:addons → Look for Antigravity

Fix Steps

Fix A: Update to the Latest Version (Success rate: 98%)

On Mac:

# Mac App Store usually auto-updates
# Or: App Store → Antigravity → Update

On Windows:

# Via Microsoft Store, or
# Antigravity app → Settings → Check for Updates

Browser Extension:

Chrome: chrome://extensions → Antigravity → Click Update
Firefox: about:addons → Antigravity → Check for Updates

Fix B: Clear Cache After Updating (Success rate: 70%)

Old cache files can interfere even after you update:

rm -rf ~/.antigravity/cache
rm -rf ~/.gemini/cache

Then restart the app and sign in again.

Error 6: Two-Factor Authentication or Passkey Issues

What it looks like: After signing in with Google, you're prompted to verify a security key or passkey. The verification screen appears but then either freezes or fails.

Two-factor authentication adds security, but can sometimes cause compatibility issues if your browser doesn't support the authentication method or your security device isn't accessible.

Diagnosis Steps

1. Check your browser version:

   • Chrome: Settings → About Google Chrome → Check for updates
   • Update if you're behind

2. Check WebAuthn support (paste this in the console, F12):

   if (window.PublicKeyCredential) {
     console.log("WebAuthn supported: YES")
   } else {
     console.log("WebAuthn supported: NO (browser too old)")
   }

3. Verify your security device:

   • Is your phone nearby with Bluetooth on?
   • Is your security key plugged in?

Fix Steps

Fix A: Use a Different Sign-In Method (Success rate: 100%)

On the passkey verification screen, look for:

• "Use a different method"
• "Can't use your security key?"
• "Sign in with password"

Click it and authenticate with your Google password instead.

Fix B: Update Your Browser (Success rate: 90%)

Older browsers don't support WebAuthn. Update to the latest version:

# Chrome, Safari, Firefox all auto-update
# But you may need to restart the browser

Fix C: Review Your Google Account's 2FA Settings (Success rate: 50%)

If you keep running into passkey problems:

1. Visit Google Account Security
2. Look for "2-Step Verification"
3. Consider temporarily disabling it, signing in, then re-enabling it
4. This forces Google to re-sync your security devices

Complete Sign-In Troubleshooting Checklist

If none of the specific fixes above work, run through this comprehensive checklist.

Quick Fixes (5 minutes)

• [ ] Reload the page (Cmd+R / Ctrl+R)
• [ ] Close and reopen the Antigravity app
• [ ] Sign out of Google, then sign back in
• [ ] Restart your browser

Moderate Fixes (15 minutes)

• [ ] Clear browser cookies and cache completely (Settings → Privacy)
• [ ] Delete local Antigravity files (rm -rf ~/.antigravity ~/.gemini)
• [ ] Try in an Incognito/Private window
• [ ] Turn off your VPN temporarily
• [ ] Try a different browser

Detailed Diagnosis (30 minutes)

• [ ] Check Antigravity status page for server issues
• [ ] Copy any error messages from the browser console (F12) and search for them
• [ ] Try signing in on a different device
• [ ] Update Antigravity to the latest version
• [ ] Update your browser to the latest version
• [ ] Contact Antigravity Support with console error messages and screenshots

Looking back

Antigravity sign-in errors usually have straightforward fixes. The most common solutions are:

• Clear cookies and cache: Fixes 70% of authentication issues
• Restart the app: Fixes 70% of hanging states
• Wait 5-15 minutes: Fixes rate-limit errors 99% of the time
• Delete .antigravity/ folder: Fixes backend sync errors 85% of the time

If you've tried the specific fix for your error and it didn't work, move through the comprehensive checklist. Almost all issues resolve there.

For issues that persist after all these steps, document your error messages from the browser console (F12) and reach out to Antigravity Support with screenshots and details. Also check the official status page to see if there are known server-side issues affecting sign-in.