Why is this feature error when compiled?

I wrote some classes to play with and I got this weird error after hit compile.

If I hit Show, point me to this… :confused:

You’re are probably referencing a glyph that does not exist. Look at the word immediately before the indicated spot. Are you sure you have an uppercase Idotless in your font?

Recommended reading:
https://glyphsapp.com/tutorials/troubleshooting-a-font-that-does-not-export

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Yes, Icaron is made by Idotless and the caroncomb…

[FIXED!] glyph name was Idotles :relieved:

why the debugger didnt show me that instead?