"Prepared or callable statement has more than 2000 parameter marker"?
You may encounter this error on the Forecast People Assigner. This is because there is a limit of 2000 parameters in a single SQL statement sent to a SQL server database. The error means that the limit has been exceeded.
The number of parameters used must be reduced. The best method to reduce the number of parameters sent is to use the report criteria filters so that individual values are not selected in the filter box. Each filtered value uses one parameter, so if you have a large number of projects/task/people selected, you can hit that upper 2000 parameter limit. The "<All Projects>" and "<All People>" indicators in the filter boxes use only one parameter each.