Let's resolve the error you're having to reconnect your bank successfully to QuickBooks Self-Employed, @usermrsjow1.
Can you tell us more about the bank that you're trying to reconnect the bank and the exact error message that you're having? That'll help us get the best resolution for the error you're having.
If you're having an error in the mobile app, then I suggest isolating the error you're having by reconnecting the bank through the web. Here are the steps:
Go to the Gear icon ⚙ and select Bank accounts.
Select Connect another account.
In the search box, enter the name of the bank and account type.
Follow the on-screen instructions to connect your account.