Error received on SMP on 12w34a when placing an item frame. Get kicked from server with "Internal Server Error" with the below error in the console. Works in singplayer
java 7

java.lang.NoSuchMethodException: kc.<init>(vg, int, int, int, int)
        at java.lang.Class.getConstructor0(Class.java:2721)
        at java.lang.Class.getConstructor(Class.java:1674)
        at ru.a(SourceFile:43)
        at ru.a(SourceFile:28)
        at rz.a(SourceFile:94)
        at gz.a(SourceFile:246)
        at hd.a(SourceFile:372)
        at ej.a(SourceFile:58)
        at be.b(SourceFile:333)
        at hd.d(SourceFile:56)
        at he.b(SourceFile:35)
        at gb.b(SourceFile:30)
        at net.minecraft.server.MinecraftServer.r(SourceFile:449)
        at fx.r(SourceFile:222)
        at net.minecraft.server.MinecraftServer.q(SourceFile:380)
        at net.minecraft.server.MinecraftServer.run(SourceFile:313)
        at es.run(SourceFile:536)
2012-08-23 14:26:38 [WARNING] Failed to handle packet: java.lang.NullPointerException
java.lang.NullPointerException
        at ru.a(SourceFile:31)
        at rz.a(SourceFile:94)
        at gz.a(SourceFile:246)
        at hd.a(SourceFile:372)
        at ej.a(SourceFile:58)
        at be.b(SourceFile:333)
        at hd.d(SourceFile:56)
        at he.b(SourceFile:35)
        at gb.b(SourceFile:30)
        at net.minecraft.server.MinecraftServer.r(SourceFile:449)
        at fx.r(SourceFile:222)
        at net.minecraft.server.MinecraftServer.q(SourceFile:380)
        at net.minecraft.server.MinecraftServer.run(SourceFile:313)
        at es.run(SourceFile:536)