Full error message: class_eu_vs_s: classifier found edge midpoint ON, edge topology should have been shared
I have attached database: fontErr-K.g
The initial error was on: facetize fontUcEbm-K.f fontUcEbm-K.c, which subtracts one part from another then unions the subtracted part.
I tried several of the usual workarounds, none helped here.
File: fontUcEbm-K1.c does the subtract only, and works fine, making fontUcEbm-K1.f.
File: fontUcEbm-K2.c is the union of the correct subtract, from above and the subtracted part. This FAILS as above.
I tried reversing order of the order of the unioned items, Files: fontUcEbm-Kr.c and fontUcEbm-K2r.c both FAIL as above.