Font not working

I am working on an Indic (devanagari) font which is made in an existing otf open source font file…
the last two times I exported the font (with new modified letters) I could use it…(I also changed the name from xyz to abc in the info and the new off was abc.otf) now after a few more changes the off again says xyz.otf instead of abc even though the glyphs file says abc. and the font gets saved in the font book as abc though.

the main issue is that even if the font is saved in Font Book… I can’t use it on Illustrator now

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