MakeOTF error "empty block"

Glyphs
1

Hi,
I get a MakeOTF error message when compiling my opentype features : it says there is an empty block in my classes (which aren’t empty), even if I make an automatic “All” class. It was working earlier, I don’t understand where it comes from. Could you help me to fix it?

Thanks!

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2

This tutorial might give you hint where to look: https://glyphsapp.com/tutorials/troubleshooting-a-font-that-does-not-export

3

Do you have a prefix containing class definitions?

4

No Rainer, only a prefix with lookups, calling classes but not defining them.

Thank you Georg, I found it! After a few modification I had a diferent message:
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I didn’t understand because there wasn’t even a line 7 in the class All.
So I tried the generateFont command and it showed me where the problem was… Obviously, it was only a syntax error in one of my lookups. But in my prefix “my_lookups”, not in any class.

Thank you for your time!

5

An OT error is sometimes referenced in the item that follows the problem. In what precedes the All class, there may be the start of a lookup definition, but it may not be closed properly: lookup xxx {...} xxx;

Perhaps the semicolon missing?

Well, that shouldn’t happen. Classes need to be defined before they are called.
Can you post the content of the prefix?

6

Yes, that was the problem, it wasn’t closed properly… I wrote: lookup xxx {…} lookup xxx;
My bad, I’m a beginner in opentype and still not very comfortable with syntax.

But now it works, even though I call the classes in the “prefix” section but only define them in the “class” section.
I guess it’s fine as in the features.fea doc the class section goes befor the lookups.

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