Merge replication agent reports the below error:

Error Message: {call sp_MSenumchanges(?,?,?,?,?,?,?,?)}
Last Command: The process could not enumerate changes at
the 'Subscriber'.
Error Detail: The process could not enumerate changes at
the 'Subscriber'.
(Source: Merge Replication Provider (Agent); Error number:
-2147200999)
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Could not find stored procedure ''.
(Source: <subscribing servername> (Data source); Error
number: 2812)
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The subscriber is MSDE 2000 SP3a.

Thanks.