Exception reading C:\Users\Caleb\AppData\Roaming\.minecraft\saves\Buttons\level.dat_old
java.lang.NullPointerException
	at du.a(SourceFile:427)
	at du.a(SourceFile:76)
	at ea.a(SourceFile:66)
	at du.a(SourceFile:427)
	at du.a(SourceFile:76)
	at du.a(SourceFile:427)
	at du.a(SourceFile:76)
	at du.a(SourceFile:427)
	at du.a(SourceFile:76)
	at du.a(SourceFile:427)
	at du.a(SourceFile:76)
	at ed.a(SourceFile:117)
	at ed.a(SourceFile:82)
	at ed.a(SourceFile:26)
	at bbu.a(SourceFile:83)
	at bbu.c(SourceFile:75)
	at bbr.b(SourceFile:58)
	at bkc.e(SourceFile:36)
	at bkc.<init>(SourceFile:29)
	at bka.b(SourceFile:42)
	at bho.a(SourceFile:367)
	at bes.a(SourceFile:902)
	at bhv.a(SourceFile:238)
	at bho.a(SourceFile:341)
	at bhv.a(SourceFile:502)
	at bho.k(SourceFile:404)
	at bho.p(SourceFile:381)
	at bes.t(SourceFile:1586)
	at bes.av(SourceFile:970)
	at bes.a(SourceFile:398)
	at net.minecraft.client.main.Main.main(SourceFile:124)