Trying to complete the "Create an approval process that validates when a Prospect Account becomes a Customer."

Challenge Not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Insert failed. First exception on row 0; first error: FIELD_CUSTOM_VALIDATION_EXCEPTION, Account number must be 8 characters long.: [AccountNumber]

 

I've followed step 2 step by step.  There should be two fields on th Battle Station Custom object (Project Status and Weapons Status).  I have only completed step 1, and when I go to verify step 2, it states I don't have the correct field count....