# Mark class definition - export Error **URL:** \ **Category:** Glyphs\ **Tags:** feature, export\ **Created:** [July 19, 2024, 5:43pm UTC](https://forum.glyphsapp.com/t/mark-class-definition-export-error/30815 "2024-07-19T17:43:57Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![khhipashvili](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/khhipashvili/32/22926_2.png) [@khhipashvili](https://forum.glyphsapp.com/u/khhipashvili)\ **Post date:** [July 19, 2024, 5:43pm UTC](https://forum.glyphsapp.com/t/mark-class-definition-export-error/30815/1 "2024-07-19T17:43:57Z")
Hey Guys! I’m having problem exporting the font file, but I can’t find the exact problem in the mark class feature. How can I fix it? thanks in advance. ![Screenshot 2024-07-19 at 21.27.17](https://forum.glyphsapp.com/uploads/default/original/3X/3/5/35171446d9ee2fcebe23e7f6e6ad510ca39b56b5.png) ---
**Author:** ![GeorgSeifert](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/georgseifert/32/259_2.png) [@GeorgSeifert](https://forum.glyphsapp.com/u/GeorgSeifert)\ **Post date:** [July 19, 2024, 6:12pm UTC](https://forum.glyphsapp.com/t/mark-class-definition-export-error/30815/2 "2024-07-19T18:12:17Z")
That sounds like you have an anchor name with an invalid character. Can you open the feature file in the temp folder and see what is at line 170? ---
**Author:** ![khhipashvili](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/khhipashvili/32/22926_2.png) [@khhipashvili](https://forum.glyphsapp.com/u/khhipashvili)\ **Post date:** [July 19, 2024, 6:23pm UTC](https://forum.glyphsapp.com/t/mark-class-definition-export-error/30815/3 "2024-07-19T18:23:23Z")
here’s line 170 ![Screenshot 2024-07-19 at 21.41.21](https://forum.glyphsapp.com/uploads/default/original/3X/6/1/61fbefd437c0bd44388d361e498558a923ec7426.png) ---
**Author:** ![GeorgSeifert](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/georgseifert/32/259_2.png) [@GeorgSeifert](https://forum.glyphsapp.com/u/GeorgSeifert)\ **Post date:** [July 19, 2024, 10:48pm UTC](https://forum.glyphsapp.com/t/mark-class-definition-export-error/30815/4 "2024-07-19T22:48:39Z")
Could you please send me the .glyphs file? ---
**Author:** ![khhipashvili](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/khhipashvili/32/22926_2.png) [@khhipashvili](https://forum.glyphsapp.com/u/khhipashvili)\ **Post date:** [July 19, 2024, 11:28pm UTC](https://forum.glyphsapp.com/t/mark-class-definition-export-error/30815/5 "2024-07-19T23:28:12Z")
sure, send it on dm thank you. ---
**Author:** ![mekkablue](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/mekkablue/32/23_2.png) [@mekkablue](https://forum.glyphsapp.com/u/mekkablue)\ **Post date:** [July 20, 2024, 9:29am UTC](https://forum.glyphsapp.com/t/mark-class-definition-export-error/30815/6 "2024-07-20T09:29:24Z")
Seems like you reverse engineered an existing font. This is not the primary usecase for Glyphs. You may need to rename glyphs and redo the features from scratch. ---
**Author:** ![Tosche](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/tosche/32/412_2.png) [@Tosche](https://forum.glyphsapp.com/u/Tosche)\ **Post date:** [July 20, 2024, 10:12am UTC](https://forum.glyphsapp.com/t/mark-class-definition-export-error/30815/7 "2024-07-20T10:12:42Z")
What are you doing with someone else’s retail font, let alone mine? It’s strictly against license agreement! ---
**Author:** ![khhipashvili](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/khhipashvili/32/22926_2.png) [@khhipashvili](https://forum.glyphsapp.com/u/khhipashvili)\ **Post date:** [July 20, 2024, 10:24am UTC](https://forum.glyphsapp.com/t/mark-class-definition-export-error/30815/8 "2024-07-20T10:24:40Z")
Hey Toshi, I’m so sorry for misunderstanding i’ve purchased the license, I’m Type Designer for Georgian Script and just wanted to add Georgian Glyphs to existing font, because without Georgian I really can’t use it. I’m very much beginner in this type of work, so I’m sorry if I am not allowed to do that. absolutely in love with the font, amazing job. ---
**Author:** ![mekkablue](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/mekkablue/32/23_2.png) [@mekkablue](https://forum.glyphsapp.com/u/mekkablue)\ **Post date:** [July 20, 2024, 10:26am UTC](https://forum.glyphsapp.com/t/mark-class-definition-export-error/30815/9 "2024-07-20T10:26:27Z")
Better to do that in a separate font then. Before reverse engineering an existing font, check if the EULA allows it. Most EULAs don’t. ---
**Author:** ![khhipashvili](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/khhipashvili/32/22926_2.png) [@khhipashvili](https://forum.glyphsapp.com/u/khhipashvili)\ **Post date:** [July 20, 2024, 10:32am UTC](https://forum.glyphsapp.com/t/mark-class-definition-export-error/30815/10 "2024-07-20T10:32:04Z")
Thank you, I’ll do it in a separate file then. ---
**Author:** ![GeorgSeifert](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/georgseifert/32/259_2.png) [@GeorgSeifert](https://forum.glyphsapp.com/u/GeorgSeifert)\ **Post date:** [July 21, 2024, 1:07pm UTC](https://forum.glyphsapp.com/t/mark-class-definition-export-error/30815/11 "2024-07-21T13:07:33Z")
the glyph caroncomb.alt contains an anchor “topright@ascender”. Remove the “@ascender” part.