Как остановить репликацию в SQL server 2012

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Мне нужно остановить репликацию в sql server 2012, потому что, когда я обычно добавляю столбец в таблицу students, появляется это сообщение

'Students' table
- Unable to modify table.  
It is invalid to drop the default constraint on the rowguid column that is used by merge replication.
The schema change failed during execution of an internal replication procedure. For corrective action, see the other error messages that accompany this error message.
The transaction ended in the trigger. The batch has been aborted.

Что я уже пробовал:

'Students' table
- Unable to modify table.  
It is invalid to drop the default constraint on the rowguid column that is used by merge replication.
The schema change failed during execution of an internal replication procedure. For corrective action, see the other error messages that accompany this error message.
The transaction ended in the trigger. The batch has been aborted.

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