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: REQUIRED_FIELD_MISSING, Required fields are missing: [Discount_Percent__c]: [Discount_Percent__c]

Here is the thing I need to complete
Field-Level Security— 1.Customer SSN and Bank Account fields on contact records must be encrypted.
2. Any change in the Amount field on opportunity records must be recorded.
I have completed first part. Do I have to create a fromula field for on opportunity object ?