Downloading ELF Process failed

I'm using altera quartus ii 12.1 subscription edition and i'm having the same problem when running the nios ii programme. It compiles fine. I have added system id component and checked again. It didn't solve the problem. Then I removed .metadata folder and contents in the software folder and run the project again. It was not the solution for me. Later I reset the USB blaster path. However I still have this problem. It seems the problem is with Nios ii subscription license. I'm using floating license server in Quartus ii. I set the path of nios ii license in the same settings path separated by ; symbol. Is it the correct way to add the license to nios ii ip core (/s or /f)?