The Aggregate Points tool fails if the input polygon contains Point_Count, Point_Count_1, and Point_Count_1_1 field names which are the results of consecutive runs of this tool.
This was no longer reproducible after the December 2014 update.
解决办法
Workaround video: <a href="http://screencast.com/t/nUNtrnThJvL" target="_blank">http://screencast.com/t/nUNtrnThJvL</a>1. Show table for the last result layer.2. Create new Integer fields.3. Calculate the values from those fields to the new ones.4. Delete the old ones (Point_Count, Point_Count_1, and Point_Count_1_1).