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Quickbooks File Repair — Internal database error *** ERROR *** Assertion failed: 201502 (11.0.1.2250)

"Internal database error *** ERROR *** Assertion failed: 201502 (11.0.1.2250)" is a Sybase assertion-failed error raised by the database engine that QuickBooks runs on, and it is classed as a recoverable error. The numbers identify the internal assertion and the database engine version, and the message means the engine hit a state it could not accept and stopped the operation.

What this error means

QuickBooks stores company data in a Sybase database engine. An "assertion failed" is the engine's way of saying it found data or a condition that violates its own internal rules, so it halts rather than proceed on a bad state. The assertion number (here 201502) identifies which check failed, and the version string identifies the engine build. In practice this almost always traces back to corruption or an inconsistency inside the company file's database structures.

Symptoms you'll typically see

  • The assertion-failed message appears when opening the file or during an operation.
  • QuickBooks may close, or the company file may refuse to open at all.
  • The same assertion repeats on the same action.
  • In multi-user mode, users may be dropped when the engine halts.

Common causes

  • Corruption in the database structures inside the company file.
  • An interrupted write from a crash, power loss, or forced shutdown.
  • A dropped network connection while the database engine was committing data.
  • Disk problems affecting the stored file.

What you can safely try first

  • Restart the computer (and the server, if hosted) so the database engine starts clean, then reopen the file.
  • If the file opens, back it up immediately, then run Verify Data and Rebuild Data.
  • Test a recent known-good backup on a healthy machine to confirm whether the damage is recent.

When professional recovery is the safer path

If the assertion blocks the file from opening, or it returns after a Rebuild, the database engine has found damage the built-in tools cannot repair from inside QuickBooks. Repeatedly forcing the engine past a failed assertion risks deeper loss. Our engineers work with the underlying database directly, repairing the structures that triggered the assertion and recovering the data the engine refused to load.

For a file the engine won't open, see QuickBooks data recovery or start a recovery. All recovery is done in-house in North America under our no-data, no-charge guarantee.