MakeOTF error during Advanced Contextual Alternates

Trying to get the type to rotate alternatives and I keep running into this error—

I’m following this tutorial

Those lines for the classes, starting with Con0:, go in the classes. For example, the Con0: B C D … example line in the tutorial is indicating to create a class named Con0 where the contents for that class are B C D …. In that referenced tutorial, take a look at the section titled Cycling Through Glyph Classes. It describes how to create a class. Hope that helps some.

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that worked thanks

In your Screenshot you can see that the class code was not added properly. This causes the error displayed in the screenshot you posted above. This is explained in the tutorial. Look for instance at the animated GIF: