Index Bounds error message on Export otf

Exporting an otf font gives the error “index Bounds” (Glyphs 2). What does it mean? Any hint? ( .ttf works )

image

Terminal output is
makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <ccedilla.alt001.001> (X2)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uni0424.001>

makeotfGlyphs [WARNING] negative non-edge stem width (fixed)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <Phi.001>

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uniFEF0.liga.hasi>

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uniFEF0.liga.s0>

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uniFEF0.liga.s1>

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uniFEF0.liga.s2>

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uniFEF0.liga.s4>

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uniFE8A.liga.hasi> (X2)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uniFE8A.liga.s0> (X2)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uniFE8A.liga.s1> (X2)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uniFE8A.liga.s2> (X2)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uniFE8A.liga.s4> (X2)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uni0664.002>

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <uni20BF.vt> (X7)

makeotfGlyphs [WARNING] stem/stem3 conflict (resolved) (X2)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed)

makeotfGlyphs [WARNING] negative non-edge stem width (fixed) <brevedotcomb.cap>

makeotfGlyphs [FATAL] INDEX bounds

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