application dup_acct_on_trans

"Failed to save record because This transaction has duplicate accounts. The main line of the transaction and the line labeled '' both use the account named 'Checking - WF'."

With the above error, this means that some of the customer deposits/cash sales/refunds are already under 'Checking - WF' Account (see NS Account to confirm).
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To fix the error, you will need to make sure all charges and refunds for your payout are in Undeposited Funds so when the Payout flow runs, it will create a Deposit and add all from UndepFunds to the Main Checking - WF Account.

This does not apply to Checking WF only but also to other accounts. Any transaction in other accounts instead of Undeposited Funds will result to an error.