Backup Exec 2012 with Vmware backup issue

Hi,

I need help,

I installed new backup Exec 2012 in windows 2008 server and configured backup for VMware hosts with around 12 virutal machines,

I started backup, its getting fail with below error, but logon credentical test is getting successful. any one guide me.

Error,

nativo.fresenius-kabi.cl Backup-Incremental -- The job failed with the following error: Backup Exec could not log on to the server with the logon account specified for it. The logon account does not have valid credentials. Ensure that the user name and password are correct in the logon account.

Thank you,