AH error log

[13:38:32] [Server thread/INFO]: UnDrac issued server command: /ptotal UnDrac
[13:38:32] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'ptotal' in plugin ActivityHistory v0.2.4
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:703) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:955) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:817) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:47) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:667) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
Caused by: java.lang.ArrayStoreException
    at java.lang.System.arraycopy(Native Method) ~[?:1.7.0_51]
    at java.util.ArrayList.toArray(Unknown Source) ~[?:1.7.0_51]
    at psy.ActivityHistory.PlayerLogFile.getFirstSession(PlayerLogFile.java:156) ~[?:?]
    at psy.ActivityHistory.PlayerLogFile.<init>(PlayerLogFile.java:38) ~[?:?]
    at psy.ActivityHistory.PlayerLogFile.<init>(PlayerLogFile.java:25) ~[?:?]
    at psy.ActivityHistory.cmd.FilePQCE.loadLogFile(FilePQCE.java:86) ~[?:?]
    at psy.ActivityHistory.cmd.FilePQCE.onCommand(FilePQCE.java:34) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    ... 13 more
[13:38:44] [Server thread/INFO]: UnDrac issued server command: /ppercent UnDrac
[13:38:44] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'ppercent' in plugin ActivityHistory v0.2.4
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:703) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:955) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:817) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:47) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:667) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
Caused by: java.lang.NullPointerException
    at psy.ActivityHistory.cmd.FilePQCE.onCommand(FilePQCE.java:63) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-59-g6efeddf-b3074jnks]
    ... 13 more