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My world dont load anymore. it crashes if i want to join it. i play Attack of the b-team on the technic launcher

It says this if i want to join my world.

java.lang.NullPointerException: 



    at net.minecraft.network.MemoryConnection.func_74436_b(MemoryConnection.java:169)

    at net.minecraft.network.MemoryConnection.func_74429_a(MemoryConnection.java:57)

    at net.minecraft.network.NetServerHandler.func_72567_b(NetServerHandler.java:669)

    at net.minecraft.server.management.ServerConfigurationManager.func_72354_b(ServerConfigurationManager.java:929)

    at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:134)

    at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:97)

    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)

    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)

    at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:129)

    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)

    at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)