Quickbooks File Repair — Error code: C=55, 64

Error C=55, 64 typically follows a network interruption — the network temporarily went down or crashed and locked the QuickBooks company file mid-operation. The abrupt loss of connection can leave the file's internal lists in a damaged or out-of-sync state.

What C=55, 64 means

When the network connection to a hosted company file drops while QuickBooks is writing, the file can be left in an inconsistent state. The C=55 and related conditions surface afterward, often as list damage — the indexes that organize customers, vendors, items, and other lists no longer line up correctly.

Symptoms you'll typically see

• The error appears after a network outage or crash while the file was open.
• Lists behave oddly, fail to sort, or show entries out of order.
• QuickBooks reports the file was locked or could not be accessed cleanly.

Common causes

• The network temporarily went down while the file was in use.
• A network crash that locked the QuickBooks company file.
• List index damage caused by the interrupted write.

What you can safely try first

• Make a backup copy of the file before touching it further.
• Open the company file and access each list in turn, starting with the Customer/Job list.
• Re-sort each list: if the "Re-sort List" option is grayed out, move any entry on the list, then go back and choose Re-sort. You may need to do this for every list.
• Run Verify Data and Rebuild Data after re-sorting to confirm the file is consistent.

When professional recovery is the safer path

If re-sorting the lists and rebuilding do not clear C=55, 64, the network interruption damaged the file more deeply than the built-in tools can repair. Our engineers can recover the data and rebuild the damaged list structures, usually without loss. Every file is handled in-house in North America, and our no-data-no-charge policy means you pay nothing unless your data is recovered.

See QuickBooks data recovery or start a recovery and our team will review your file.