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java.lang.NullPointerException: 	at java.util.TreeMap.getEntry(Unknown Source)	at java.util.TreeMap.get(Unknown Source)	at com.forgeessentials.economy.commands.CommandSellprice.calcPriceList(CommandSellprice.java:222)	at com.forgeessentials.economy.commands.CommandSellprice.parse(CommandSellprice.java:107)	at com.forgeessentials.core.commands.ParserCommandBase.func_71515_b(ParserCommandBase.java:20)	at net.minecraft.command.CommandHandler.func_71556_a(CommandHandler.java:94)	at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:739)	at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:718)	at net.minecraft.network.play.client.C01PacketChatMessage.func_148833_a(SourceFile:37)	at net.minecraft.network.play.client.C01PacketChatMessage.func_148833_a(SourceFile:9)	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)	at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)