If you are attempting to E-File through Software & receive Error Message "Index was Outside the Bounds of the Array", this Support Article will explain.
Example:
Reason for this Error is due to incorrect placement of Recipient Data Full First/Last Name or Company Name when creating or importing Recipients in software.
You will need to review all recipients under the Payer Company in software by selecting "Payers & Recipients" > "Manage Payers & Recipients" on top Menu bar then select the Payer Company.
Next Select each Recipient one at a time & click on "View/Edit Recipient" button, then Verify Recipient First & Last Name "or" Company Name are in the appropriate field boxes and be aware Company Name must be in the "Alternate Name" field box Only. (No non allowed Special Characters).
Save each Recipient after making the needed changes.