Description
Only the points that fall inside the aggregation polygons will be included in the analysis. In order to provide reliable results, at least 30 points should be inside the polygon areas you provide.
Solution
Unfortunately, if you do not have at least 30 points, this method is not appropriate for your data; otherwise, you should provide bounding polygon areas that overlay at least 30 of your points. The bounding areas should reflect all the locations where points could possibly occur.