Installation Failed on one MT4 but successful in another on the same VPS

 

got two terminals

Terminal A: EA 1A

Terminal B: EA 1B

Both on same VPS.


I am trying to change the EA on Terminal B, it shows "Installation is failed".

But when I go Terminal A and download the new EA it is successful. 

What could be wrong? They are both on the same VPS just different instances.