Problems creating hashes/solid fills for polylines

Hi, I'm using LibreCad version 1.0.0rc1 on a windows PC, I've been having trouble getting polylines to turn into polygons. Closing the polylines using the 'close' command works fine but when i select the object and try to hash it its gives me the error message: "Invalid hatch area. Please check that the entities chosen form one of more closed contours."
any help would be appreciated.