خطا در Configur Distribution

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سلام
در زمان Configur Distribution با خطای زیر روبرو شدم لطفا راهنمایی کنید
Configuring...
- Configuring the Distributor (Error)
Messages
* SQL Server could not configure 'MyComputer' as a Distributor. (Microsoft.SqlServer.ConnectionInfo)

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ADDITIONAL INFORMATION:

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)

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An error occurred during decryption.
There is no remote user 'distributor_admin' mapped to local user '(null)' from the remote server 'repl_distributor'.
Changed database context to 'master'. (Microsoft SQL Server, Error: 15466)

- Enabling Publisher 'MyComputer' (Stopped)