Event ID 28005; Error 15517

Hello.
I have a problem with SQL Server 2005 SP2:

An exception occurred while enqueueing a message in the target queue.
Error: 15517, State: 1. Cannot execute as the database principal
because the principal "dbo" does not exist, this type of principal
cannot be impersonated, or you do not have permission.

Can you help me about this problem?
Thank you.
.

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