Hello everyone,
I also encountered the “Authentication Required” issue while using Antigravity IDE. While this solution may not apply to every case, it successfully resolved the problem for me.
Solution
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Switch to a different web browser (for example, from Chrome to Edge or Firefox)
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Sign in to Antigravity IDE again
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The authentication error was resolved immediately
Additional Notes
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This method may also help with issues where no model is available for use
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The root cause may be related to browser cache, cookies, or session conflicts
I hope this helps anyone facing the same issue.
If you have other solutions or insights, feel free to share.