Im having trouble converting XSI files to mesh files ,this is the message I get when using convertxsi:

Ignoring unknown material type <24>: DefaultLib.Scene_Material
Valid Material not found for PolygonList: DefaultLib.Scene_Material
Bounding Information Calculated - Radius:-1.00
Optimizing...
Pre-Optimization Vertex Count = 0
Post-Optimization Vertex Count = 0

 Basicly it does not recognize any Vertex thus my mesh is invisible (inexistent) and the mesh filesize doesnt exceed 1kb.I have no idea what is causing it ,I have experimented with a simple cube and got the same results,it definetly doesnt have poligons with more then 5 sides since I checked 4 times and it's a perfect simetric cube (the XSI default one).

 Soo ,anyone able to provide any solutions or tell me what im doing wrong ?