SQL 2008R2 - The merge process could not set the status of the subscription correctly??

Hi Everyone,

I have SQL Server 2008 R2 with push subscriptions enabled to 10 computers. It was all working and replicating fine till yesterday when out of no where I have been receving the following errors for each of the subscriptions :

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Error messages:

• The merge process could not set the status of the subscription correctly. (Source: MSSQL_REPL, Error number: MSSQL_REPL-2147200963)
  Get help: http://help/MSSQL_REPL-2147200963
• Could not find stored procedure 'dbo.sp_MScheckIsPubOfSub'. (Source: MSSQLServer, Error number: 2812)
  Get help: http://help/2812

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I have tried a lot of searching on various SQL Server forums but have not been able to find out the exact cause for it and how to solve it.

Any help would be greatly appreciated.

Thanks