Message Oracle ORA-27351 - conflicting values of job attributes string and string

ERRORconflicting values of job attributes string and string
CAUSEThe values of two attributes passed in to the CREATE_JOBS call or the JOB object constructor conflicted with each other. This is usually because both attributes cannot be non-NULL at the same time.
ACTIONResolve the conflict by changing the value of one of the attributes and issue the call again.