MakeOTF error doesn't let me export

Hey there! all of a sudden, when I try to export, this evil window pops up so I can’t export. Any suggestion to work it out?

Thanks in advance!

have a look in this thread Exporting error 'offset overflow'

Fixed! So in a nutshell I have too much latin kerning in my font? And what exactly the Use Extension Kerning parameter does?

It has to do with the structure of the GPOS table. Without the extension, it can only be 64kb in size. But using extension makes it move out of the 64kb box but makes it a bit bigger.