except_orm: ('ValidateError', u'Error occurred while validating the field(s) arch: Invalid XML for View Architecture!')

I've been stuck in this error since 4 hours ago. I searched everywhere, copy the right solutions, but nothing changes. class jobsopen(osv.osv): _name = 'jobsopen.jobsopen' _columns = { 'name':fields.char('Name', size=20, required = True), } jobsopen.jobsopen.treejobsopen.jobsopen I already tried to put:tree But it continues not to work.