Hello I'm sorry you've encountered this problem. I'm taking a look into it now, it seems to be having a problem with the developer mode. At the moment it's not entirely clear why you're having this issue. I just set up the plugin in a fresh project after downloading a copy of my plugin from itch and was able to get it working. I also added the mog plugins shown in the error stack and was unable to replicate the error.
Best guess at the moment is that there's a conflict with another plugin you're using.
It's a bit weird that it can't find the createDevText function as the function is located within the plugin itself.
Does the plugin work for you if you disable the developer mode?