Gemini Error “(5)” — Quick Fix Guide

■ What this error actually is

“An error has occurred. (5)” is a generic internal failure in Gemini.
It mainly appears on the web version (Chrome/Windows) and often affects only one model (2.5 Pro or 2.5 Flash).

Many users report:

• PC browser → Error (5)
• Smartphone app → works fine

■ Main causes

1. Corrupted browser session/cache
2. A specific model (Pro/Flash) being temporarily down
3. Extensions, VPN, or organization-level restrictions
4. Google-side outage (quite common)

■ Fastest fixes (ranked by effectiveness)

1. Switch the model
   • Pro ↔ Flash
     This alone fixes it in many cases.
2. Open Gemini in Incognito mode
3. Clear cache/cookies (Google/Gemini only)
4. Restart browser → log in again
5. Use the mobile app temporarily

If none works → it’s almost certainly a server-side issue, and users report it resolves after hours/days.

■ Environment assumed in this article

• Windows 11 + Chrome
• Gemini 2.5 Pro
• December 2025
• PC only shows “(5)” error, mobile app works
  → Matches multiple community reports

■ Reference URLs

1. https://support.google.com/gemini/thread/385755213
2. https://support.google.com/gemini/thread/385709074
3. https://note.com/oscience/n/nf3f2145b5e45
4. https://www.gcafe.jp/gemini-error/
5. https://www.seminarsonly.com/news/gemini-error-5-fix-an-internal-error-has-occurred/