Converting .fbx files to g3dj not working - libgdx

Question

iMac:fbx-conv me$ ./fbx-conv-mac -v -o G3DJ courier.fbx
INFO: FBX to G3Dx converter, version 0.01.0061 x64 , FBXSDK 2014.02
STATUS: Loading source file
PROGRESS: Import FBX 100.00%
STATUS: Converting source file
STATUS: Closing source file
VERBOSE: Listing model information:
VERBOSE: ID :
VERBOSE: Version : Hi=0, Lo=1
VERBOSE: Meshes : 0 (0 vertices, 0 parts, 0 indices)
VERBOSE: Nodes : 0 root, 0 total, 0 parts
VERBOSE: Materials : 0 (0 textures)
STATUS: Exporting to G3DJ file: courier.g3dj
STATUS: Closing exported file
I'm using maya lt to export an object to fbx for conversion.
The 3d model is downloaded from the maya market site, imported and exported to fbx.
The returned .g3dj file is almost empty. Loading it in libgdx
assets.load("data/courier.g3dj", Model.class);
doesn't show anything either.
Anyone know what went wrong?
.g3dj file:
{
"version": [ 0, 1],
"id": "",
"meshes": [],
"materials": [],
"nodes": [],
"animations": []
}
I had some success trying blender which return me this:
iMac:fbx-conv me$ ./fbx-conv-mac -v -o G3DJ palm_tree.fbx
INFO: FBX to G3Dx converter, version 0.01.0061 x64 , FBXSDK 2014.02
STATUS: Loading source file
PROGRESS: Import FBX 12.50% palm_tree
PROGRESS: Import FBX 25.00% 02 - Default PROGRESS: Import FBX 37.50% Map #1
PROGRESS: Import FBX 50.00% Map #1
PROGRESS: Import FBX 62.50% Take 001
PROGRESS: Import FBX 75.00% BaseLayer PROGRESS: Import FBX 87.50% PROGRESS: Import FBX 100.00%
STATUS: [shape(palm_tree)] Triangulating FbxMesh geometry
VERBOSE: [shape(palm_tree)] polygons: 1032 (3096 indices), control points: 724
STATUS: Converting source file
STATUS: Closing source file
VERBOSE: Listing model information:
VERBOSE: ID :
VERBOSE: Version : Hi=0, Lo=1
VERBOSE: Meshes : 1 (743 vertices, 1 parts, 3096 indices)
VERBOSE: Nodes : 1 root, 1 total, 1 parts
VERBOSE: Materials : 1 (1 textures)
STATUS: Exporting to G3DJ file: palm_tree.g3dj
STATUS: Closing exported file