MakeOTF Error: Error: "Glyph "o" not in font (featMapGName2GID)" in Feature salt in line: 4

Hi - I’m getting the following error when I try to export:
The glyphs mentioned in the error (o, o.ss01, q, q.ss01…) were deleted at some point, and there are not there anymore, at least they do not appear in the main Font view (‘All’).

Please let me know - thank you

Error: “Glyph “o” not in font (featMapGName2GID)” in Feature salt in line: 4
Error: “Glyph “o.ss01” not in font (featMapGName2GID)” in Feature salt in line: 4
Error: “Glyph “q” not in font (featMapGName2GID)” in Feature salt in line: 5
Error: “Glyph “q.ss01” not in font (featMapGName2GID)” in Feature salt in line: 5
Error: “Glyph “o” not in font (featMapGName2GID)” in Feature ss01 in line: 4
Error: “Glyph “o.ss01” not in font (featMapGName2GID)” in Feature ss01 in line: 4
Error: “Glyph “q” not in font (featMapGName2GID)” in Feature ss01 in line: 5
Error: “Glyph “q.ss01” not in font (featMapGName2GID)” in Feature ss01 in line: 5

You likely still reference those glyphs in the OpenType features.

Open the menu File > Font Info (Command-I). Select the Features tab. Assuming those features were automatically generated, press the Update button at the bottom lower-left of that window. If the features were manually created, you’ll need to remove those glyphs from the salt and ss01 features, by hand.

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yes - that was it! Thank you for the prompt reply.

how do I remove the manually: do I erase all the lines that have the error:
sub uni0633 by uni0633.ss01;

I want to remove all .sso1 and .sso2 glyphs…

Please advice as I am not familiar with the coding system here

Yes. You could remove them manually or let Glyphs auto generate the features.