XF 2.1 Language installation "Oops! We ran into some problems..."


New member

I'm trying to import a language. This is a .xml file which is an export from an other XenForo ("almost same version: 2.1.8 patch 2 to 2.1.9):

But I have this message:

"Oops! We ran into some problems. Please try again later. More error details may be in the browser console."

An idea of what is wrong ?