# Font Creator 15 Red Circle

**URL:** <https://forum.high-logic.com/t/font-creator-15-red-circle/8290>\
**Category:** FontCreator - Discussion\
**Created:** [April 6, 2024, 5:46pm UTC](https://forum.high-logic.com/t/font-creator-15-red-circle/8290 "2024-04-06T17:46:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Nebuldu](https://forum.high-logic.com/user_avatar/forum.high-logic.com/nebuldu/32/9348_2.png) [@Nebuldu](https://forum.high-logic.com/u/Nebuldu)\
**Post date:** [April 6, 2024, 5:46pm UTC](https://forum.high-logic.com/t/font-creator-15-red-circle/8290/1 "2024-04-06T17:46:27Z")

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Hi!  
When creating the condensed and expanded styles of the font, a red error sign appears in the images for glyphs such as Aogonek and aogonek. What does the letter T next to the sign mean? This error only appears with some glyphs.

 ![Picture.png](https://forum.high-logic.com/uploads/default/original/2X/9/98df16a9d13045476b6fd63c36b177f4305caf72.png)

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**Author:** ![ErwinDenissen](https://forum.high-logic.com/user_avatar/forum.high-logic.com/erwindenissen/32/9430_2.png) [@ErwinDenissen](https://forum.high-logic.com/u/ErwinDenissen)\
**Post date:** [April 6, 2024, 6:02pm UTC](https://forum.high-logic.com/t/font-creator-15-red-circle/8290/2 "2024-04-06T18:02:01Z")

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As you can also see in the Validation panel, the specific glyph layers contain transformed components. This is not a real issue, however as the specification does not allow mixed transformations, such glyphs will be decomposed.

The specific letters that relate to interpolation issues are:

O → Outlines  
M → OutlineContourMismatch or OutlineComponentMismatch  
F → OutlineContourFlavour (layers contain mixed quadratic and cubic contours)  
N → OutlineNodeType (mismatch in On and Off curve nodes)  
D → OutlineContourDirection  
S → OutlineContourStart  
W → OutlineContourSwapped or OutlineComponentSwapped  
T → OutlineGlyphMatrix (Scaling, Rotation, Skewing)  
A → Anchors

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<div class="post-metadata">

**Author:** ![Nebuldu](https://forum.high-logic.com/user_avatar/forum.high-logic.com/nebuldu/32/9348_2.png) [@Nebuldu](https://forum.high-logic.com/u/Nebuldu)\
**Post date:** [April 6, 2024, 6:28pm UTC](https://forum.high-logic.com/t/font-creator-15-red-circle/8290/3 "2024-04-06T18:28:16Z")

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Thank you.