The plugin doesnt support characters which are not part of the ansi/latin-1 set. If possible, try changing material and texture names accordingly.
Thanks for the answer! I noticed one of the material were named with chinese charaters, so I changed it to letters, but when I tried to export it again, it showed me another error information:
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Python: Traceback (most recent call last):
File "C:\Users\Administrator\AppData\Roaming\Blender Foundation\Blender\4.2\scripts\addons\io_scene_v3o\export_v3o.py", line 745, in _write
write_file(full_path, obs, depsgraph, scene,
File "C:\Users\Administrator\AppData\Roaming\Blender Foundation\Blender\4.2\scripts\addons\io_scene_v3o\export_v3o.py", line 290, in write_file
polygons[totpolys+1] = [pverts[0]+totverts+1, pverts[1]+totverts+1, pverts[2]+totverts+1, materials[p.material_index].name]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'name'