Auto-Rig Pro Error

Sup guys it’s a little off-topic but one of my collaborators has run into this issue while trying out Blender’s Auto-Rig Pro add-on on my model. I attached a screen cap of the error message, I’m not quite sure what more to say about it as I only recently started learning Blender myself. The error occurred when trying to add an armature to the character. If anyone knows about Blender and Auto-Rig, got any idea what could be the cause?