cannot be executed as a database principal because the principal "dbo" does not exist, cannot impersonate this type of principal, or you do not have the required permissions. The database context has been changed to

Right-click to delete post times error message:

Additional Information:
An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)
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cannot be executed as a database principal because the principal "dbo" does not exist, cannot impersonate this type of principal, or you do not have the required permissions. The database context has been changed to ' AdventureWorks2012 '. (Microsoft SQL Server, Error: 15517) for help information, click: Http://go.microsoft.com/fwlink? Prodname=microsoft%20sql%20server&prodver=11.00.2100&evtsrc=mssqlserver&evtid=15517&linkid= 20476

Workaround:

Use EXEC' database system administrator ' 

To view the owner of the database:

Select owner_sid, Lo.sid, Lo.name, Lo.loginname,db_namefrominner  joinon    = Lo.sid

cannot be executed as a database principal because the principal "dbo" does not exist, cannot impersonate this type of principal, or you do not have the required permissions. The database context has been changed to