There is an error entry at the bottom of the log similar to this:
This error comes directly from the Intuit Software Development Kit (SDK) and indicates that QuickBooks has shut down abruptly - and unable to communicate any further with the file.
There are three possible causes:
Cause 1. Please review our installation guides: https://clearify.com/wiki/view/157/installation. The dedicated synch server user (in a remote desktop environment) - or the administrative console (in a local network environment) never gets logged out of. If you log out of that dedicated server user, then the QuickBooks client can't run, and therefore QQube cannot communicate with QuickBooks. Remember that developers do not have direct access to the database, and instead communicates via the QuickBooks client (not server).
Cause 2. The Intuit SDK (Software Development Kit) does not allow two applications to simultaneously communicate with QuickBooks. Make sure that no other 3rd party QuickBooks application - including their backup program - runs at the same time QQube attempts to communicate with QuickBooks and extract data.
Cause 3. Rebuild the QuickBooks file and reload from scratch in QQube. This has a 50/50 chance of working. If you get this same error again, then it is necessary to contact QuickBooks support and convince them to take the file into Intuit Data Services to repair the file.
CONVINCING INTUIT TO TAKE YOUR FILE
If you perform a rebuild, using the QuickBooks - and it shows no errors - and you still get the same 80040402 error during the synch, then there is a corruption problem underneath the hood, that the rebuild, or verify logs may - and probably won't - not show.
In these cases, QuickBooks will not take the file, and attempt to throw the problem back at you - and QQube. However, we, like all QuickBooks 3rd party developers, are beholden to the Intuit SDK, and if the SDK is unable to pull data, there is nothing that anybody can do to get around the problem.
So, we need to give Intuit Support proof that the SDK is unable to extract the information from QuickBooks.
THE INTUIT SDK CREATES A LOG
There is a file called qbsdklog.txt in which Intuit logs SDK the details of the interaction between QuickBooks and a 3rd party application like QQube. It is located in c:\ProgramData\Intuit\QuickBooks
When you get the 80040402 error a second time, immediately grab the qbsdklog.txt and Create a Support Ticket, attaching that file, as well as the QQube synch log.
We can review the files, and ensure that you have the correct "ammunition" you need to convince Intuit that you have corruption in your file, and that they need to accept the file to fix it.
IF THE FILE IS LARGE CONSIDER ALTERNATIVES
If your file is one of the following:
Then we strongly advocate getting someone like Matt Clark at http://www.qbornotqb.com to split your file into two files: (1) with old data, that you can open - or store in QQube, and (2) a current file for every day use. DISCLAIMER: We do not receive kickbacks from this company - we recommend him because he has successfully taken care of hundreds of customers over the last decade.
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