It has come to my attention that there is a bit of code in the default bot holes events.cs, specifically 'setWeapon' having a problem because of calling getClassName on item data. I'm not sure why this is nessessary, instead it should just be checking if the item has an image. Here is a patch which fixes this issue
DOWNLOAD PATCHplace events.cs in Bot_Hole.zip and overwrite the existing file