SQL SERVER 2016 error when modifying “User Mapping”.

TITLE: Microsoft SQL Server Management Studio

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Rename failed for User ‘dbo’. (Microsoft.SqlServer.Smo)

For help, click: https://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=16.100.37971.0&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Rename+User&LinkId=20476

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

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Cannot alter the user ‘dbo’. (Microsoft SQL Server, Error: 15150)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&ProdVer=13.00.5026&EvtSrc=MSSQLServer&EvtID=15150&LinkId=20476

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BUTTONS:
OK

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Solution:

Log in to SQL SERVER STUDIO with SA and execute the following command.

use testdatabaseName
EXEC sp_changedbowner ‘sa’,’true’

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