Download Elf Process failed

Hi,

i am working on cyclone V soc (5csxfc6d6f31c8) and using nios II as processor. i have generated sof and sopcinfo and also programmed the device successfully. But after configuring the nios and generating the .elf this error pops up -

Downloading Elf Process failed

In the Eclipse Console window I get the following lines:

Using cable "USB-BlasterII [USB-1]", device 2, instance 0x00

Resetting and pausing target processor: FAILED

Leaving target processor paused

i have read many posts relating to this but i am not able to figure out the actual issue.

Please help me with this asap.

Thanks in advance.