Getting the DMA Interface for PCIe to work with the Arria 10 GX FPGA Dev Kit

Hello All. I am trying to get the DMA Interface to work with the Arria 10 GX Development Kit. I downloaded the reference design (https://cloud.altera.com/devstore/platform/16.0.2/standard/an708-pcie-gen3x8-avmm-dma-with-external-memory/) from the design store, and I downloaded the driver/application (http://www.alterawiki.com/wiki/reference_design:_gen3x8_avmm_dma_-_arria_10) from the alterawiki. I was able to successfully compile the reference design on Quartus and program the FPA, and then I built the linux driver by following the directions described int he wiki. When i tried to run the driver, I am getting the following message in my terminal: "couldn't open the device." The wiki doesn't have any troubleshooting information about what this message means or how to resolve it. I am running CentOS 7 and the board is connected to the host through both USB-Blaster and PCIe. My guess is that the driver is unable to connect to the board through PCIe, but I am not sure how to tackle the issue. Any help would be much appreciated! Thanks.