getting an error of target processor paused failed

Are you getting the following error when using NIOS2:

Using cable "USB-BlasterII [1-1.1]", device 1, instance 0x00

Pausing target processor: not responding.

Resetting and trying again: FAILED

Leaving target processor paused

If so, then you haven't set the reset vector of the NIOS2 processor. To fix this do the following:

1. Open your NIOS2 system in QSYS/Platform Designer.
2. Select the NIOS2 CPU to bring up its Properties page.
3. Select the Vectors tab, and under Reset Vector MEmory : select the on-chip memory instance or the debug memory slave.
4. Do the same for the Exception vector Memory.

This will depend on your design and what you want to do when a reset occurs in the design. If you want to processor to go to the start of your code after reset, set it to the on-chip memory setting.

Save and Generate the system. Build the project and try to download the code to the Kit. It should work now.