Informatica Data Validation option

I wanna try DVO 9.6 and i have an error that make me stopped.plase i need help

Severity: DEBUG Timestamp: 10/1/2017 1:59:07 PM Node: node01_DESKTOP-U5UQ90O Thread: MAPPING Process ID: 5748 Message Code: DBG_21366 Message: Note: Input column [NEXTVAL] default value is [ERROR('transformation error')]. Row will be skipped if input value is null