Project/Level fails to load with and error..

Hi,

Been working on the project for a while, but it seems to crash after awhile.
There was same problem last week,
so i deleted DerivedDataCache. as i read it some where over internet that rebuilding every data of project from scratch will help.
Ended up wiping unreal from machine and reinstalling it… Fortunately it solved the problem for a while…
But it occurred again, now I’am unable to open the same project…
BTW other project are working just fine…