Hi All,
Can anyone help me in understanding the following apex errors occurring while a validate my changeset in production:

1. System.DmlException: Insert failed. First exception on row 0; first error: UNKNOWN_EXCEPTION, Use one of these records?Stack Trace: Class.unsubscribe.testUnsubscribe: line 110, column 1 
2. System.DmlException: Insert failed. First exception on row 0; first error: UNKNOWN_EXCEPTION, Use one of these records?Stack Trace: Class.unsubscribe.testUnsubscribe2: line 141, column 1 

The apex errors are occurring in the Apex class "unsubscribe". A warning message is also displayed indicating code coverage failure. 
Very new to Salesforce and trying to help the charity iam volunteering for to deploy some changes to production. 
Any help would be greatly appreciated.