Error "The font contains letters with the same Unicode"

Glyphs
1

Got the same error in Glyphs.App:
_The font contains letters with the same Unicode. _
Please check the letters: \ nunixxxx = unixxxx.alt1
unixxxx = unixxxx.alt1
I need these .alt Glyphs since they are part of liga Feature:
sub [unixxxx unixxxx ]’ [unixxxx unixxxx unixxxx ] by [unixxxx.alt1 unixxxx.alt1 ];
What am i doing wrong?

2

But you can only have the Unicode value once

3

The liga Feature is supposed to combine different Glyphs into a new Ligature. For instance:
sub [unixx01 unixx02 unixx05 unixx06 unixx09 ]’ by [unixx01.alt2 unixx02.alt2 unixx05.alt2 unixx06.alt2 unixx09.alt2 ];
How do i make Glyphs accept these alternate letters?

4

You can have all these glyphs, no problem, but the Unicode value must be unique. This is also what the error message tells you. Do you know how to set/delete the Unicode value?

This is not a ligature substitution. A ligature substitution is substituting two or more glyphs into one.

5

Understood, I found doubled a couple of Glyphs using the same Unicodes value and deleted them. Collision solved, thank you @mekkablue.
Is there a sleeker way of finding doublets and setting or deleting the Unicode value than just typing them into the pull-up box on the left bottom?
Where else would i put script that if not into liga, ligature substitution?

6

Solved that with a lookup:

lookup ligaX {
sub uniXX01 uniXX02 by unXX01.liga;
} ligaX;

7

You can have Glyphs autobuild your ligature feature. Just name your ligatures appropriately, e.g., x_y.liga For a ligature of x and y. See the appendix of the handbook for details.

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