 So, you don't understand why you're getting this error. Not a problem. If you're getting an error that says it's unable to find bind poses, the way to solve this is to go to Display, uncheck Dag Objects, then type in Bind. Then delete all the bind poses you see here. Then go back under Show and recheck Dag Objects. Then select all the joints in your rig by holding Shift and Left Clicking, then open the script editor and type in Dag Pose Negative S Negative VP. Then hit the green play button to create a new bind pose. And now on, when you export, you should not get the error message anymore. Hope that helped and as always, hope you have a fantastic day and I'll see you around.