So there's been a twist of events. I was getting ready to prep a new file to send your way, and now the error will not trigger anymore. I should note that I had changed nothing from the original project where it was happening, I had just duplicated the folder, opened that, and the error stopped triggering (in both of them).
However, now all my sprites are incredibly blurry, whether you are viewing them in the scene, or in the animation editor (etc). I tried deleting and re-importing 2D toolkit, but that didn't change anything anyways. Do you have any ideas of what might be causing this? Would you like to see the file?
Thanks for bearing with me here