(I'm using Textadept version 11.4 on Linux)
I've used this tool in the past to make themes for Textadept without issue, but there appears to be an issue at the moment where the "Textadept" theme option is not working correctly. I've provided a screenshot showing the errors being produced when I try to use a theme. I still have themes that I've made using this tool in the past which continue to work for me.
I'll look further into this, and please feel free to ask me any questions you may have.
