Thank you for your answer.
1. Yes I am using Hercules, you are right, I thougt I had to change on job_exp because of a tutorial from here I was following that it was for Hercules. but now I understand that I have to change exp_group_db.conf.
2. The error happend in any level actualy, where HP and SP are both 1/1. That happend after I edited the job_exp,
But, following what you said with exp_group_db and leaving job_exp uneditted, it seems that worked well. Thank you so much.