LogReader fails with Cannot execute as the database principal because the principal “dbo” does not exist

LogReader fails with error 15517: 2010-02-25 21:16:35.054 Status: 0, code: 20011, text: 'The process could not execute 'sp_replcmds' on 'CHRISSKACER'.'. 2010-02-25 21:16:35.056 The process could not execute 'sp_replcmds' on 'CHRISSKACER'. 2010-02-25 21:16:35.057 Status: 0, code: 15517, text: 'Cannot execute as the database principal because the principal "dbo" does not exist, this type of principal cannot
Read More »