Rebuild Error Code 310, I still cannot backup QB Desktop Pro 2018

I had a similar issue. Calling QB support was useless. I was on the phone for over 90 minutes and they just didn't comprehend my issue.

Seems to me that you may have had encrypted credit card data stored in a customer that you deactivated. That's my story. Out of 478 errors, I only have 471 to go...

Rebuild your file and view the results. Click/expand error 310. Print that list. Next, export your customer list to an .iff file and open it in excel. Search for the customer ID from the error list in the spreadsheet. Get the customer name. Find the customer name in QB customer list. Go to payment settings and enter a dummy credit card number. Click Save.

I did that for 5 customers and the errors were reduced by 5. 

Let me know how it goes!

Thank you so much marjmeds!  I had the same problem and have been searching for answer for quite a while.  Your solution worked for me!

How do I export the customer list to an .iff file. I have QuickBooks 2021, and cannot find how to do that

It will take a few steps, Igve. I'll walk you through exporting the customer list to an .IIF file.

You can follow these steps:

1. Click File.
2. Go to Utilities.
3. Click Export, then select Lists to IIF Files.
4. In the Export window, select Customer List, then click OK.
5. Enter a file name, then click Save. 

Let me add some articles that will help you learn more about IIF files:

• IIF Overview: import kit, sample files, and headers
• Export, import, and edit IIF files

Reach out to us if you have other concerns. We'll be right here to assist you. Keep safe!

Awesome advice!!  Thank you so much.  Spent hours on telephone with Right Networks (I used hosted quickbooks desktop) and Intuit tech support and noone could give me the simple answer you describe above.  That helped eliminate the fatal errors so I can now condense to convert to QBO.

Thanks Kristine.  You made the process so easy to accomplish.  Greatly appreciated!!

Thanks for the customer reference # info.  My case was an expiry date had been entered but no credit card number (using Desktop). Once that info is entered it cannot be deleted.  Adding a fake number fixed the problem.  Wish there was a way of removing a customers credit card information from their account.

You are a lifesaver!  Intuit wanted to charge me $4,000 to fix this error - from 20 years ago!

Now my next issue - need to condense my 20+ years of data since the file is far too large.

Thanks again!

You are a lifesaver!  I have been dealing with Intuit on this issue and they wanted to charge me a fortune to fix the problem.  This fixed it  

Now if only I can figure a way to Condense this QB file that contains 20+ years of data.  

Thanks again!

@gwynnMVP 

Intuit wanted to charge me $4,000 to fix this error

Did you pay for it? I'm not sure you're dealing with the Intuit Support team.

Which QB Desktop year version do you run? You should be able to run the Condense Data utility.

https://quickbooks.intuit.com/learn-support/en-us/help-article/data-utilities/use-condense-data-util...

If you are using an older version than 2019, use the trial version of QBD 2019 or a newer version to upgrade your file and condense it. You can use the trial version of QB for good if required.

once I export it now what?  Not sure the next step to open it Thanks

Welcome to the Community, @DJA1963.

I'll help you import back the exported files to QuickBooks Desktop.

Here's how:

1. Sign-in to your company file as an admin.
   Note: If you’re in Multi-user mode, go to the File menu, then select Switch to Single-user Mode.
2. Go to the File menu, then select Utilities.
3. Choose Import, then select Import IIF.
4. Select the IIF file you want to import, then hit Open.
5. Click OK to confirm the import.

Here is an article you can read for the detailed steps: Export, import, and edit IIF files.

For future reference, I'm adding this article about other tasks you can do with IIF files: Tasks you can do with IIF files.

Don't hesitate to click the Reply button below if you have questions about exporting and importing files in QuickBooks Desktop. I'm always here to help. Have a great day.

@DJA1963 

If you are not familiar with IIF, you should have a 3rd party migration tool instead to use XLS or CSV.