Separate names with a comma.
I had this problem too but then upgrading to 17.1 seems to fix it. Unfortunately that also "upgrades" the video driver from prl_vid to virgl which...
I recently upgraded from version 17.0 to 17.1.0 as 17.0 was crashing frequently. Seems that the prl_vid driver is no longer used in 17.1 and virgl...
