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This error occurs when Quickbooks is unable to link an item to one of its invoice.

The following are the probable causes for this error:

1) The Item has been deleted in Quickbooks. Please verify the presence of the item.

2) We were trying to create a dummy item inside the transaction and that failed. 

This happens in the case of Credit Memos or Invoices or Refunds, where we might have to add some custom line items to adjust 

rounding/ account for payment fees and require an additional "Dummy" item to be attached.

We will figure out what went wrong while linking the item to the transaction.