Common issues with the mobile app can be resolved by refreshing your data. Since you still get the error after you reinstalled the app, I suggest using a web browser to update the transactions in QuickBooks Online.
If you get the same result, I recommend contacting our Support Team so they can take a look at your account and help identify what's causing this unexpected behavior.
Also, take note of the specific error message you encounter. Additional details about your concern will help determine the exact steps to resolve the issue. To contact them, please follow the steps below:
Go to the Help menu at the upper right.
Enter your concern or the error message.
Click Let’s talk.
Select how you want to reach out to our support team: Start messaging or Get a callback.
Type in your contact info.
I've attached an article that provides quick access to useful resources, like how to run reports and update your billing information: Mobile Applications Hub.
Drop me a comment below if you have any other questions. Take care.