export kf with 2.49


I am new to blender and having some problem with exporting. When I try export “.blend” file to “.kf” format (I’ve just installed nif scipts) I get a message on console: “value error: generator already executing”. (It does the same with nif formats) I am not so familiar to python either so I don’t know how to solve it. Any of your help will be appreciated!

Thank you!