A Comprehensive Guide to QuickBooks database error C=51:

QuickBooks desktop is one of the popular accounting software which is being used by many companies for their accounting needs. Used all over the world, this software sometimes faces several technical errors which can be resolved by following some steps. In case of complicated errors, sometimes you may need to take assistance from experts or you can simply follow the troubleshooting procedure.

The QuickBooks Error Code C=51 is one such error that gives a warning to you stating that QuickBooks is not able to find TxList. In this article, you will learn about this error and what steps you can take to resolve this error.

What is QuickBooks Error Code C=51?

QuickBooks Error Code C=51 is an error that typically occurs when you try to access a QuickBooks company file that is either damaged or corrupted. This error can also occur when you try to create, delete or edit a report or a transaction. While using QuickBooks, you may face the Error Code C=51 which gives the following warning-

ProblemQuickBooks cannot find the TxList from the list of txLists.

This usually occurs when a user tries to remove txList from the list of other txLists and then is unable to find it. This can also occur when you try to remove a transaction from any of the reports. Users usually get very tense when they are unable to get rid of this error but you can follow these quick fixes first.

First of all, close all the reports and shut down QBW. When you face this error, just shut down the application, and close all Windows including QuickBooks also. After this, restart the application and repeat the action in which QuickBooks error C=51 was received.

Various Causes behind the QuickBooks error message C=51

Several causes may lead to the QuickBooks Error code C=51. These are listed below:

  • Inadvertent deletion of transactions in the txLists.
  • The transaction log file (.TLG- in the same folder as the corrupted QBW file)
  • Also, corrupted QuickBooks data file (.QBW)
  • Malware or virus attack on your computer.
  • Poor internet connection.
  • An older backup of the QuickBooks data file (.QBW or .QBB or .QBM)

Read Also: Fix QuickBooks Error 1321- Installer Has Insufficient Privileges

Causes and Solutions of QuickBooks Error Code C=51

In this elaborate section, we provide you with all the plausible causes and the necessary troubleshooting measures to be implemented to rectify those causes of the QuickBooks error C=51. So, make sure to stick to this piece if writing till the conclusion.

Cause 1: Interruption in the Connection

There is some problem in the network connectivity while the system undergoes downloading process. This may have prevented some transactions from getting downloaded. Thus, you are not able to check the transactions which results in error C=51.


Make sure that before you start the downloading process, you check the Internet Connection properly so that there is not such issue in between the process.

Cause 2: Trying to access the lost transactions

Please note that you will not be able to access the transactions that have been lost or deleted from the QuickBooks company file.


Try restoring the lost transaction. Restore all the accidentally deleted or altered transactions: You can find the accidentally deleted or altered transactions in QuickBooks Audit Trail Report. Re-enter the information to restore the transactions.

The Audit Trail will reveal all the transactions entered in the company file including those which were deleted earlier. Another benefit is that it also displays the historical changes that were made. You can open the report using following steps:

Step 1: Head to the Reports menu.

Step 2: Choose Accountant and Taxes, and the tap on Audit Trail.

Audit Trial Option - Screenshot
  • If transactions were lost due to technical problem: In this case, you can restore the lost transactions and its data by using QuickBooks Backup (.QBB) file.
  • During this process, ensure that the backup file is updated.

Also see: How to Resolve the QuickBooks Error Code 61?

Cause 3: Damage caused to data

When you try to find the lost or damaged transaction from the QuickBooks Company file, then you can receive the QuickBooks error code C=51. This error usually occurs when the data in the transaction is damaged.

Solution 1: Verify Data

When you run the ‘Verify Data’ utility, then you can also encounter the data issues that occurred in the QuickBooks Company file. And when you run ‘Rebuild Data’ then you are able to fix the data integrity issues which Verify Data utility finds. Steps to run Verify Data utility:

  • Proceed to File > Utilities > Verify Data
Verify hosting data
  • If you receive this message- ‘“QuickBooks detected no problems with your data,” then no further action is required. If the message comes ‘Your data has lost integrity’, then there is some data damage in the company file. When the data damage exists, then run ‘Rebuild data’ and fix the issue.

NOTE: If you are an Assisted Payroll customer, then you should contact an Assisted Payroll agent before you run Rebuild Data.

Solution 2: Rebuild Data

Step 1: Navigate as follows : File > Utilities > Rebuild Data

Verify and Rebuild Data in QuickBooks Desktop - Screenshot

1st Step: If you want to backup your company file, then tap on OK tab.

2nd Step: Find where you want to Save the backup, and hit on the OK button.

3rd Step: Hit OK as soon as you receive message that ‘Rebuild has completed

Rebuild has completed - Screenshot

Once all the above steps completed, run the ‘Verify Data’ again. Now, check if any other data damage exists.

You may read also: How to Resolve QuickBooks Error Code 6189 and 816?

Alternate Methods to Fix QuickBooks Error Code C=51

You can try fixing the QuickBooks error code C=51 using the below set of steps and procedures. Only in case the above steps didn’t work:

1st Method: Restore the backup files

  • When the backup files restored, tap on the Ctrl + C keys and move the files to the new folder.
  • Verify the size of the file, and ascertain that it meets the limit.
  • Right-click on the File and hit on Properties.
  • If the backup file is less than 6 MB then it is the wrong backup file.
  • Make a Backup file again.

2nd Method: QuickBooks file doctor tool

QuickBooks File Doctor tool - Screenshot

3rd Method: Close QuickBooks processes

Close QBW32.exe process - Screenshot
  • Close all the tabs in QuickBooks.
  • Shut down all the QB-related files using the Task manager.
  • Reopen the QuickBooks and then perform the same work where the issue appeared.
  • Rebuild the data in a proper format.

See also: What is QuickBooks Error Code 5510?

Final Words!

We discussed all the possible causes and solutions to get rid of QuickBooks error C=51. Internet connection, lost transactions, including other reasons are some of the primary causes of this error. In case of major issues, you can contact our QuickBooks enterprise error support team. There is absolutely no need to worry if the error still exists. All you need to do is contact our experts, who will make sure that the error gets rectified at the earliest. We have solutions to all your QB-related queries.


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