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[17:34:29] [Client thread/INFO]: Setting user: adamwootten
[17:34:30] [Client thread/INFO]: (Session ID is token:e3755f50fd1c4cf2a7fe0eaa29b3c367:39f27671375f4250a31727a853aa1009)
Exception in thread "Client thread" java.lang.NullPointerException
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213)
at com.google.common.collect.Lists$ReverseList.<init>(Lists.java:767)
at com.google.common.collect.Lists.reverse(Lists.java:759)
at lt.b(SourceFile:156)
at lt.<init>(SourceFile:43)
at net.minecraft.server.MinecraftServer.<init>(SourceFile:155)
at bpo.<init>(SourceFile:41)
at ave.<init>(SourceFile:293)
at net.minecraft.client.main.Main.main(SourceFile:124)

Please help me