Error on export: The operation couldn’t be completed. Instance is outside of the interpolation space: Thin

Getting this error on exporting my 9-weight font file as a variable .ttf: The operation couldn’t be completed. Instance is outside of the interpolation space: Thin. Any help is much appreciated!

What’s your master setup and what are the values for that Thin instance?

It says that Thin is extrapolation, i.e. that Thin is not between but outside the span of the masters. That is not possible with OTVars.

It exported totally fine with Glyphs 2, that’s why i’m kind of confused here.

It’s about the thin instance: does it have weight below 100 or a width other than 5?

Nope:

Look at your Axes Coordinates section. The Thin Width is set to 100. That’s probably causing a problem given your Masters setup since they all have a Width of 5.

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And if all master have the same value in the Width field, I would remove the Width axis altogether.

Solved!
I just had to make sure all my widths were set to 5. Thank you for the help!

I would strongly recommend to remove the width axis.

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