Error : "Trigger must be associated with a job detail"

Error : "Trigger must be associated with a job detail" 

String sch ='0 5 0 * * ?';

ProcessApproval_sched  p = new ProcessApproval_sched();system.schedule('Process Approval Schedular For Every Day 12:05 A M ', sch , p);

when we run the above the code snippet from the Anonymous window , we saw the above error 

"Error : "Trigger must be associated with a job detail" .

This is because job name has a blank space  at the end . 

we rectified the above issue by removing the space at the end of the job name .