I used to export my font without problems, but since today I can export the font and I open it with FonExplorer but I can’t activate it. And when I open it with the font book it only allow me to see the regular form.
Please any help is welcome 
You need to tell us a bit more about your setup. and have you read this: Eliminating Font Cache Problems | Glyphs and Testing Your Fonts in Adobe Apps | Glyphs