How to Fix QuickBooks Error Code C=51
QuickBooks users often report about receiving ‘QuickBooks Error c51: can’t find txList’. You may receive this error message while working on transactions in your QuickBooks company file (.qbw).

What is QuickBooks Error Code C=51?
When working in a QuickBooks company file, you may get error C=51. It usually happens when you cannot find txList from the lists of txLists or while removing a transaction from any report.

What Causes QuickBooks Error Code C=51?
Some plausible causes that may result in QuickBooks Error Code C=51 are:

NOTE: Before looking at the following causes and solutions to fix QuickBooks Error C=51, try to fix the error by simply closing all the running applications, transaction reports and QuickBooks Desktop program. Restart QuickBooks and perform the same action that resulted in ‘QuickBooks Error C=51’. This may help fix the issue. If the problem still persists, continue reading the post.

Cause 1 – Interrupted Connection
Problem with network connectivity during the downloading process may have prevented some transactions from getting downloaded. And as a result, you might not be able to find the transactions, resulting in error C=51.

Solution – Check your Internet connectivity

Before downloading transactions in your QBW file, make sure that have you a strong Internet connection.

Cause 2 – Attempting to access Lost or Deleted Transactions
You may not be able to find a transaction or list of transactions that have become inaccessible or got accidentally deleted from your QuickBooks company file.

Solution – You can try to restore lost or deleted transactions

Restoring accidentally deleted or altered transactions
Accidentally deleted or altered transactions may appear in the QuickBooks Audit Trail Report. You can restore those transactions by re-entering the information. The Audit Trail Report shows all transactions that have been entered in your company file, including the deleted ones. It even helps display any historical changes made on transactions.