Export Error message: GPOS feature 'kern' causes overflow of offset to a subtable (0x11220)

When i try to export my font as an otf file, i get the error code"GPOS feature ‘kern’ causes overflow of offset to a subtable (0x11220)". How can i find the error an how can i fix it?

Greets

That means you have to much kerning. Proper setup of kerning classes can usually prevent that problem.

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Thx for the great support!