I have been having trouble converting .xsi files to .mesh, specifically I get the following error:

C:\ConvertXSI>C:\ConvertXSI\convertxsi C:\ConvertXSI\Lunarclass.xsi C:\ConvertXSI\New\Lunarclass.mesh

Ignoring unknown material type (24): DefaultLib.Scene_Material
Ignoring unknown material type (24): DefaultLib.Material1
Ignoring unknown material type (24): _3ds_scene_root.CubeClsTEX_TITANTEX
Bounding Information Calculated - Radius:-1.00
Optimizing...
Pre-Optimization Vertex Count = 0
Post-Optimization Vertex Count = 0

C:\ConvertXSI>

Currently, I use the following process to get models from Blender to SOFTIMAGE(version 4.2, no activation key):

OK so I start by exporting the model from blender as a .3ds (My SOFTIMAGE will not import .obj, I have considered that this might be my problem). The next step is importing the .3ds to SoftIMAGE, I then freeze it and deselect the object. Afterwards I export it as a "dotxsi" (version 3.6), the model I am working with is a Lunar Class Cruiser from Warhammer 40K, it has ~1500 vertices.