Reached the maximum category subscriptions per publisher limit for one of the users. The last user who reached the limit ...

Reached the maximum category subscriptions per publisher limit for one of the users.

The last user who reached the limit is %1. Use Dbanalyze or Snooper resource kit tools to see the complete list of users who reached the limit.
Cause: A user has reached the configured limit for maximum category subscriptions per publisher. Check the eventlog description for more details.
Resolution:
Please use server management tools to change the limit. Increasing the limit to a higher value might have performance implications.