Whenever I or my brother or anyone tries to edit the pixelmon npc trainer's pokemon, minecraft crashes. Also when players try to battle a pixelmon npc trainer it doesn't work. I don't know if this is because of the fact that the npcs don't have pokemon or if its just something wrong with the mod. So I tried to edit the npc's pokemon and it crashes. Please help this is really annoying and I can't find anything about it online. Here's the crash report:
[spoiler][spoiler]---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 8/1/14 6:54 PM
Description: Updating screen events

java.lang.NullPointerException: Updating screen events
at com.pixelmonmod.pixelmon.client.gui.trainerEditor.GuiTrainerEditorPokemonScreen.func_73866_w_(GuiTrainerEditorPokemonScreen.java:59)
at net.minecraft.client.gui.GuiScreen.func_146280_a(GuiScreen.java:245)
at net.minecraft.client.Minecraft.func_147108_a(Minecraft.java:746)
at com.pixelmonmod.pixelmon.client.gui.trainerEditor.GuiTrainerEditorPartyScreen.func_146284_a(GuiTrainerEditorPartyScreen.java:83)
at net.minecraft.client.gui.GuiScreen.func_73864_a(GuiScreen.java:219)
at net.minecraft.client.gui.inventory.GuiContainer.func_73864_a(GuiContainer.java:324)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:289)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:256)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1579)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:916)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:835)
at net.minecraft.client.main.Main.main(SourceFile:103)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at com.pixelmonmod.pixelmon.client.gui.trainerEditor.GuiTrainerEditorPokemonScreen.func_73866_w_(GuiTrainerEditorPokemonScreen.java:59)
at net.minecraft.client.gui.GuiScreen.func_146280_a(GuiScreen.java:245)
at net.minecraft.client.Minecraft.func_147108_a(Minecraft.java:746)
at com.pixelmonmod.pixelmon.client.gui.trainerEditor.GuiTrainerEditorPartyScreen.func_146284_a(GuiTrainerEditorPartyScreen.java:83)
at net.minecraft.client.gui.GuiScreen.func_73864_a(GuiScreen.java:219)
at net.minecraft.client.gui.inventory.GuiContainer.func_73864_a(GuiContainer.java:324)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:289)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:256)

-- Affected screen --
Details:
Screen name: com.pixelmonmod.pixelmon.client.gui.trainerEditor.GuiTrainerEditorPokemonScreen

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['sophie715'/5, l='MpServer', x=464.46, y=74.62, z=1644.58]]
Chunk stats: MultiplayerChunkCache: 182, 182
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (460,73,1651), Chunk: (at 12,4,3 in 28,103; contains blocks 448,0,1648 to 463,255,1663), Region: (0,3; contains chunks 0,96 to 31,127, blocks 0,0,1536 to 511,255,2047)
Level time: 7138598 game time, 7284118 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 26 total; [EntityClientPlayerMP['sophie715'/5, l='MpServer', x=464.46, y=74.62, z=1644.58], EntityPixelmon['entity.pixelmon.Pixelmon.name'/70, l='MpServer', x=477.50, y=64.00, z=1610.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/64, l='MpServer', x=441.44, y=51.50, z=1681.19], EntityPixelmon['entity.pixelmon.Pixelmon.name'/65, l='MpServer', x=440.06, y=51.53, z=1689.44], EntityPixelmon['entity.pixelmon.Pixelmon.name'/142, l='MpServer', x=436.50, y=38.00, z=1682.50], EntityTrainer['entity.pixelmon.Trainer.name'/192, l='MpServer', x=466.00, y=73.00, z=1643.00], EntityPixelmon['entity.pixelmon.Pixelmon.name'/169, l='MpServer', x=470.50, y=11.00, z=1617.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/175, l='MpServer', x=453.94, y=92.00, z=1623.31], EntityPixelmon['entity.pixelmon.Pixelmon.name'/172, l='MpServer', x=419.38, y=36.00, z=1627.34], EntityPixelmon['entity.pixelmon.Pixelmon.name'/110, l='MpServer', x=459.22, y=89.00, z=1606.38], EntityPixelmon['entity.pixelmon.Pixelmon.name'/108, l='MpServer', x=452.50, y=89.00, z=1603.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/106, l='MpServer', x=460.69, y=89.00, z=1608.13], EntityPixelmon['entity.pixelmon.Pixelmon.name'/107, l='MpServer', x=460.47, y=89.00, z=1608.09], EntityPixelmon['entity.pixelmon.Pixelmon.name'/104, l='MpServer', x=452.13, y=89.00, z=1600.84], EntityPixelmon['entity.pixelmon.Pixelmon.name'/178, l='MpServer', x=450.03, y=81.00, z=1630.75], EntityPixelmon['entity.pixelmon.Pixelmon.name'/179, l='MpServer', x=436.25, y=74.00, z=1637.25], EntityPixelmon['entity.pixelmon.Pixelmon.name'/125, l='MpServer', x=441.50, y=31.00, z=1648.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/176, l='MpServer', x=447.03, y=97.00, z=1605.56], EntityPixelmon['entity.pixelmon.Pixelmon.name'/63, l='MpServer', x=434.53, y=51.50, z=1680.28], EntityPixelmon['entity.pixelmon.Pixelmon.name'/122, l='MpServer', x=436.03, y=64.00, z=1604.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/61, l='MpServer', x=426.97, y=51.50, z=1619.09], EntityPixelmon['entity.pixelmon.Pixelmon.name'/121, l='MpServer', x=436.03, y=64.00, z=1605.53], EntityPixelmon['entity.pixelmon.Pixelmon.name'/180, l='MpServer', x=454.63, y=81.00, z=1632.78], EntityPixelmon['entity.pixelmon.Pixelmon.name'/181, l='MpServer', x=469.81, y=81.00, z=1628.84], EntityPixelmon['entity.pixelmon.Pixelmon.name'/120, l='MpServer', x=435.97, y=64.00, z=1606.70], EntityPixelmon['entity.pixelmon.Pixelmon.name'/60, l='MpServer', x=428.26, y=51.50, z=1682.18]]
Retry entities: 0 total; []
Server brand: cauldron,craftbukkit,mcpc,fml,forge
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:368)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2382)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:857)
at net.minecraft.client.main.Main.main(SourceFile:103)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 113690576 bytes (108 MB) / 369786880 bytes (352 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 2096 (117376 bytes; 0 MB) allocated, 3 (168 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.03 FML v7.2.165.1065 Minecraft Forge 10.12.1.1065 4 mods loaded, 4 mods active
mcp{9.03} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{7.2.165.1065} [Forge Mod Loader] (forge-1.7.2-10.12.1.1065.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{10.12.1.1065} [Minecraft Forge] (forge-1.7.2-10.12.1.1065.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
pixelmon{3.1.4} [Pixelmon] (Pixelmon-1.7.2-3.1.4-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Launched Version: 1.7.2-Forge10.12.1.1065
LWJGL: 2.9.0
OpenGL: AMD Radeon(TM) HD 6480G GL version 4.1.10600 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2408 (134848 bytes; 0 MB) allocated, 25 (1400 bytes; 0 MB) used
Anisotropic Filtering: Off (1)[/spoiler]