I am still getting crashes. updated Spigot now. Getting this error:

java.lang.ClassCastException: net.minecraft.server.v1_7_R1.TileEntityComparator cannot be cast to net.minecraft.server.v1_7_R1.TileEntityChest
<-->at net.minecraft.server.v1_7_R1.TileEntityChest.i(TileEntityChest.java:212) ~[spigot.jar:git-Spigot-1301]
<-->at net.minecraft.server.v1_7_R1.TileEntityChest.h(TileEntityChest.java:250) ~[spigot.jar:git-Spigot-1301]
<-->at net.minecraft.server.v1_7_R1.World.tickEntities(World.java:1371) ~[spigot.jar:git-Spigot-1301]
<-->at net.minecraft.server.v1_7_R1.WorldServer.tickEntities(WorldServer.java:514) ~[spigot.jar:git-Spigot-1301]
<-->at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:671) ~[spigot.jar:git-Spigot-1301]
<-->at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:273) ~[spigot.jar:git-Spigot-1301]
<-->at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:560) ~[spigot.jar:git-Spigot-1301]
<-->at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:467) [spigot.jar:git-Spigot-1301]
<-->at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [spigot.jar:git-Spigot-1301]