Cursor Common Errors Diagnostic and resolution guide for the most frequent Cursor IDE issues. Organized by error category with specific symptoms, causes, and fixes. Authentication Errors "Sign-in failed" / OAuth Loop Symptoms: Browser opens for auth, redirects back, Cursor still shows "Sign In". Fix: 1. Clear browser cookies for and 2. Try incognito/private window for the OAuth flow 3. Check if browser is blocking popups from cursor.com 4. Try a different auth method (GitHub vs Google vs email) "License not found" / "No active subscription" Symptoms: Signed in but AI features are disabled. Fi…