Something went wrong on our end while check the diff in merge request

I am using Gitlab CE. My environment details are

I tried to get the diff (changes) from the merge request. But it saying something went wrong on our end. why is this happening? Also, I tried this by changing branch name without ('/', '-'). But the same issue reproducing. I don`t know why this happening. Also, this is happening only this project only, Other projects are working fine.

Could you check and update me ASAP?