Hi,
Thanks for including the full error message. My guess is that you have not provided an output feature class name, so the tool can't create the output. The output feature class name should be the full pathname, so for example, you might enter: c:\temp\LibraryMC.shp.
I hope this resolves the problem. If not, please let me know.
Best wishes,
Lauren
Lauren Scott
ESRI
Geoprocessing, Spatial Statistics