Recently I have not been able to export fonts from the software, every time I export, the font does not export well, and when I try to open the exported file, I get this error message: Stream read error.
And then I get this message:
Cannot read font data from file C:\Users\etc.
I noticed that I can only export TTF files with True Type outline format, but in PostScript I can’t.
And if I exported True Type, I can again export the file to OTF format.
what can we do???
We have fixed some bugs, so maybe this update solves the problem.
https://www.high-logic.com/tmp/fontcreator/FontCreatorSetup15.0.0.2959-x64.exe
If the update does not solve the problem, then do send us the font project to us.
The update did not solve the problem 
I am sending you Kobbatz in your private email.
We have received a font project, but it works just fine on our test system. It would help if you provide clear instructions. Also a screenshot of your Options dialog which shows your Font tab would help, as some settings are related to exporting fonts.
I have located and fixed an issue which should solve the problem.
Please try this release:
https://www.high-logic.com/tmp/fontcreator/FontCreatorSetup15.0.0.2960-x64.exe
excellent!! solved the problem!!!