the comflict between niosII and 8b10b IPCore

Hi,

several days ago,I use DE2 to develop a FPGA project. In this project, I use niosII and 8b10b IPCore. I have not buy the 8b10b license, and the .sof file is time limited. But when I run the compiled niosII software, the develop system give me a error infomation as follows:

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

Pausing target processor: not responding.

Resetting and trying again: FAILED

Leaving target processor paused

I intend to find a solution on Internet, and I have find this is a bug of quartus 7.1. But the point is that my quartus is 7.2. So I do not why and wondder answers, thanks