Several QuickBooks users have been getting across a technical issue when downloading transactions from their financial institution. This error typically occurs in the form of . How to Resolve QuickBooks Error code 377 . This error is generally caused when users do not update their bank account in QuickBooks after a recent update. Getting past this error is an easy task and requires that users stick to some basic fixes that are explained within the ambit of this blog. The error message associated with Error 377 usually states.