Addon Development Broke My Game!

[Justinon]

I'm trying to create my first addon, and therefore I've been doing some experimentation to try to figure out functions from the API. Currently trying to make a chat addon, I have been making various function calls to experiment with them. I tried making the "AddChatContainer()" call, which ended up creating a new container at the top left. I wanted to get rid of this newly created container, as it wasn't what I was looking for. However after deleting the addon, trying to make a call on "RemoveChatContainer(0)" and "RemoveChatContainer(1)", I still have unsuccessfully removed this container. No matter what I do, I keep getting this error that won't go away (even after hitting dismiss):

Is there anything I can do to fix my game? Please help! Thank you!!