Here's the error message http://c.oppy.me/zRVYa9y3

Update your sniper:
http://ci.thevoxelbox.com/job/VoxelSniper/lastSuccessfulBuild/artifact/target/VoxelSniper-5.169.0-SNAPSHOT.jar

NOTE:
VoxelSniper no longer has LiteSnipers & Snipers, but permissions. Read more about that here:
http://voxelwiki.com/minecraft/VoxelSniper#Update_to_5.169.0