Job schedule error

When I try to run a job I am receiving the following error message:" Unable to perform a SETUSER to the requested username 'dbo' because the username is invalid for database".  Any sugguestion...I have tried different system users with the same result....Any sugguestions.
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Are you scheduling the job or manually running it?

If you are scheduling, does SQL Server agent has permissions to do the job?
rwbutler333Author Commented:
I am manually running it.
Try it with the sa account, this way you can see if it is an authority issue.
rwbutler333Author Commented:
I am still getting the same error with the sa account
Right click you job --> properties -->check the owner of job make it sa
then in the steps edit advanced check run as user should be sa and then try.

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