Help installing VoxelSniper

I downloaded the latest version of VoxelSniper (5.168.5). It says on their wiki that it's Tested Compatible With: #1.5.2-R0.1 after adding it to my server I get errors saying "An internal error occurred while attemting to perform this command." everytime I put a command. When I check VoxelSniper on Bukkit it says 5.168.5 Updated for 1.4.7-R1.0.

Is 5.168.5 compatible with 1.5.2 or i'm just doing something wrong?
HELP ME PLEASE!