program failed, can't load driver for OpenCL RTE , DE1 SoC

Hi -- I'm trying to run the hello_world example from http://www.terasic.com.tw/attachment...opencl_v02.pdf (http://www.terasic.com.tw/attachment/archive/836/de1soc_opencl_v02.pdf)

However when I type 'aoc program hello_world.aocx' it throws following error:

aocl program: Running reprogram from /home/root/opencl_arm32_rte/board/c5soc/arm32/bin

Couldn't open /dev/ac10 device! Did you load the driver?

aocl program: Program failed.

https://alteraforum.com/forum/attachment.php?attachmentid=13572&stc=1

But I can find the driver in that folder.

Initializing OpenCL

Platform: Altera SDK for OpenCL

Using 1 device(s)

de1soc_sharedonly : Cyclone V SoC Development Kit

Using AOCX: vectorAdd.aocx

ERROR: can't load drive

Failed program