Achievement Error

Hello, so yesterday I downloaded the mop client (download in background client) and I'm having some trouble with achievements. Whenever I try to view someone else's or my own achievements it doesn't open, not only that but achievements don't appear when I get them and an error pops up on my screen saying achievement ui is missing or something like that. Could anyone help me with this?

I am experiencing the same problem, an error pops up stating that ui or something missing

There is already a topic on that matter, try the search box in the forum.

running the following command fixes the problem for me :)
/run EnableAddOn("blizzard_AchievementUI")
but yea, im fairly sure there is a thread about this already