"Unable to open the device acl0" for the De5-Net FPGA Board

After I installed the drivers successfully, I still had this problem and didn't deal with it. The errors are as followings:

root@storm:/home/storm/altera/14.0/hld/board/de5net_network/tests/fft2d# aocl program acl0 bin/fft2d.aocx

aocl program: Running reprogram from /home/storm/altera/14.0/hld/board/de5net_network/linux64/libexec

Unable to open the device acl0.

aocl program: Program failed.

I appreciate someone can give me any suggestion.

Best wishes,

Jiawen