Use the following steps in order until the issue is resolved:

1.  Check the gift record to make sure the correct Financial Institution/Bank is chosen.
2.  Check the Financial Instituion's individual relationship record to make sure the checkbox for "this account is inactive" is NOT marked.
3.  Ensure the Financial Institution/Bank selected in the gift batch is the same Financial Institution/Bank listed on the Gift Record.
4.  Recreate the Batch with the gift(s) in question.