Those are not errors but warnings. When you are exporting from Blender in FBX format select Face under smoothing and try that way.
If your model has armature and bones set the Axis like this and uncheck “Add leaf bones”.
Those are not errors but warnings. When you are exporting from Blender in FBX format select Face under smoothing and try that way.
If your model has armature and bones set the Axis like this and uncheck “Add leaf bones”.