Vasari Beta 2 windrose issue

Hello, im having a really fustrating problem with creating a windrose for a site plan that has been drawn with autocad. I first open a new document, and then import the autocad dwg file into vasari. I click on "Ecotect Wind Rose", select my weather file, and click on "Send wind rose to BIM project". I then select, "Inner radius around model".

After that I either get an error which results in a wind rose diagram with incorrect data,

or this,

My site plan isnt scaled, and its excessively large. Could that be the problem? Please some one help me. My work is due in about 3 hours time. I desperately need help.