One or more ligatures have problematic sequences! All characters in a ligature sequence must have their own glyph defined and be at least two characters long, otherwise the ligature will not work for your font!
Vector font editor made by aadenboy with duct tape and rubber bands
Thanks to Joël Galeran for opentype.js
Thanks to Tim Branyen for hyperlist
Thanks to Christopher Brown for the Unicode data found in unidata