What does Windows error code 4400 (ERROR_APP_DATA_NOT_FOUND) mean?

ERROR_APP_DATA_NOT_FOUND

Fast Cache data not found.

ERROR_APP_DATA_NOT_FOUND is Win32 error 4400 (0x1130) and belongs to Fast Cache application data lookup.

Where the result appears

• Retrieving an application Fast Cache entry.
• Startup code expecting previously cached state.
• A versioned application-data lookup.
• Cache rearm or cleanup after deployment.

Likely causes

• the requested key has never been populated.
• cleanup, rearm, or user-profile change removed the entry.
• the caller used a different namespace, version, or identity.
• the cache was rebuilt after update or recovery.

Troubleshooting steps

• Record application identity, user, key, and expected version.
• Record time and result of the last successful cache write.
• Record rearm, cleanup, upgrade, and profile events.
• Record cache path or provider state.
• Record authoritative source from which data can be regenerated.

What to verify

Verify whether the requested key has never been populated. Check application identity, user, key, and expected version together with time and result of the last successful cache write.

Handling, retry, and recovery

Treat the cache miss as absence, obtain data from the authoritative source, and repopulate only after validating it. Do not convert a missing cache entry into permanent application-state loss.

Difference from nearby codes

EXPIRED and CORRUPT describe entries that exist but cannot be used; NOT_FOUND means no matching Fast Cache data is available.

Practical example

A new user profile starts an application before its cache is seeded.

References

• Microsoft: System Error Codes (4000–5999) — reference for error 4400.
• Microsoft: Storage management — reference for error 4400.
• Microsoft: Troubleshoot data corruption and disk errors — reference for error 4400.