I use 2019 Quickbooks Enterprise desktop edition and I never had this problem until now.
I installed quickbooks on a new computer. I copied over backups and the main company file. I opened the company file on the new computer, no problems. A few days went by, then one day I tried to open quickbooks and got an error that said my company file could not be opened. I exited, reloaded quickbooks and tried again. Still got the error, the company file did not load. There was no error code associated with the error.
I rebooted the computer and sometimes I was able to open the company file, and sometimes I was not. When I was not, I reloaded a backup copy. Sometimes the backup would load fine, sometimes It would not open and I get the cannot open company file error.
So I uninstalled quickbooks, rebooted my computer, and reinstalled quickbooks. sometimes the company file would load, sometimes not.
I am running windows 10, there is plenty of HD space and memory on this laptop.
I tried running the Quickbooks Fix program or whatever it is called and it did not work.
I am running quickbooks on only one computer and not sharing the company file and no multiple users
Of course I cannot keep having this happen, any ideas? I have run verify, rebuild, etc on the file. sometimes the verify finds a problem and fixes.
I believe I have tried everything. Can't have the company file unreadable at random times and cannot make backups every 30 seconds.
Thank you for choosing QuickBooks as your accounting software. Since you've tried all the possible troubleshooting steps to fix the error. I recommend getting in touch with our Customer Support Team. This way, they can pull up your account securely and help check the cause of the issue.
Go to the Help menu.
Choose QuickBooks Desktop Help.
In the Have a Question window, scroll down to choose the Contact us link.
This will display the Contact Us screen.
Go to the Tell us more about your question section to enter the issue or topic in the field box.
Click the Search button to display the Get Phone Number or Start a Message button.
Also, I’m adding a guide that lists our support hours and calls me back options to fit our customers' schedules: Support hours and types.
You can check our Help articles page to learn some tips and tricks in managing your QBDT account. From there, you can read great articles that can guide you through the steps by steps process.
Let me know how it goes by dropping a comment below. I'm just around to help. Take care!