created job application from incoming mail with resume.

"In the job application form view, we have one button labeled 'Refresh'. Upon clicking this button, i m facing the following validation error message.

Validation Error

Close

The operation cannot be completed: - Create/update: a mandatory field is not set. - Delete: another model requires the record being deleted. If possible, archive it instead. Model: Skill level for an applicant (hr.applicant.skill) Field: Skill Level (skill_level_id)

can somebody help me what is the issue , why i am not able to fetch data from resume.