yes i ca, the same command function when i do a copy in the local server. Now, i have resolved the pb with the xp_sqlagent_proxy_account command, it's executed succesfuly. But for, it's the same pb.
EXEC master.dbo.xp_sqlagent_proxy_account N'SET',
N'DELL1', -- agent_domain_name
N'manoulati'-- agent password