Drawing new frame in Symbol not working

I have a symbol that for whatever reason isn’t letting me go in and edit. I select the art but that’s all. When I try to select the pencil or brush I get the “ghostbuster.”

All the other symbols seem to work just fine. Is there something I accidentally turned on (or off) to prevent drawing/editing in the symbol?

Help!

The forbidden sign (circle with cross) means you have no right on that drawing. One can be somehow that layer is locked (it does not seem to be locked from the screenshot) or the layer or physical file is somehow corrupted or not accessible for any reason. Try duplicating that layer and see if you can continue drawing it.