Is there any way to fix this ?
lol that image is tiny.
Anyway, it just means your asset directory has been lost/misplaced. There are 2 ways to tackle it: 1.) go to the online updater and re-fetch the assets or 2.) go to settings > directory and see what your asset directory has been changed to and change it back to wherever it was (only use this option if you actually know where it used to be)