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When I am on my pixelmon server, everytime I try to place a block I crash. I don't it I break or throw a block, just place. I have a Windows 7 pc that runs 64 bit and I have Java 8.And I have tried to plava vanilla blocks too, and it still crashes. Here is my crash report:

---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 11/21/16 12:44 PM
Description: Unexpected error

java.lang.NoClassDefFoundError: com/pixelmonmod/pixelmon/items/ItemBlock
at com.waterdude.gameshark.event.ClientEventHandler.onBlockRightClicked(ClientEventHandler.java:199)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_70_ClientEventHandler_onBlockRightClicked_PlayerInteractEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:185)
at net.minecraftforge.common.ForgeHooks.onRightClickBlock(ForgeHooks.java:1026)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_187099_a(PlayerControllerMP.java:387)
at net.minecraft.client.Minecraft.func_147121_ag(Minecraft.java:1518)
at net.minecraft.client.Minecraft.func_184117_aA(Minecraft.java:2184)
at net.minecraft.client.Minecraft.func_184118_az(Minecraft.java:1961)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1749)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1055)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:371)
at net.minecraft.client.main.Main.main(SourceFile:124)
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: com.pixelmonmod.pixelmon.items.ItemBlock
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 19 more
Caused by: java.lang.NullPointerException

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

-- Head --
Thread: Client thread
Stacktrace:
at com.waterdude.gameshark.event.ClientEventHandler.onBlockRightClicked(ClientEventHandler.java:199)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_70_ClientEventHandler_onBlockRightClicked_PlayerInteractEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:185)
at net.minecraftforge.common.ForgeHooks.onRightClickBlock(ForgeHooks.java:1026)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_187099_a(PlayerControllerMP.java:387)
at net.minecraft.client.Minecraft.func_147121_ag(Minecraft.java:1518)
at net.minecraft.client.Minecraft.func_184117_aA(Minecraft.java:2184)
at net.minecraft.client.Minecraft.func_184118_az(Minecraft.java:1961)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityPlayerSP['GoldEnderDrakon'/110, l='MpServer', x=227.78, y=64.00, z=-536.40]]
Chunk stats: MultiplayerChunkCache: 441, 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (186,64,-416), Chunk: (at 10,4,0 in 11,-26; contains blocks 176,0,-416 to 191,255,-401), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 1454558 game time, 47976 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: 70 total; [EntityPlayerSP['GoldEnderDrakon'/110, l='MpServer', x=227.78, y=64.00, z=-536.40], EntityPixelmon['Cubone'/256, l='MpServer', x=296.50, y=64.00, z=-568.50], NPCTrainer['9'/2, l='MpServer', x=277.46, y=73.00, z=-450.49], EntityPixelmon['Geodude'/258, l='MpServer', x=234.50, y=70.00, z=-486.50], NPCTrainer['10'/3, l='MpServer', x=317.61, y=70.00, z=-532.56], EntityPixelmon['Dunsparce'/259, l='MpServer', x=165.50, y=68.00, z=-558.50], NPCTrainer['11'/4, l='MpServer', x=311.50, y=64.00, z=-468.50], EntityPixelmon['Dunsparce'/260, l='MpServer', x=166.50, y=68.00, z=-556.50], EntityPixelmon['Magikarp'/133, l='MpServer', x=202.34, y=58.47, z=-524.75], EntityPixelmon['Geodude'/261, l='MpServer', x=159.88, y=68.00, z=-560.20], EntityPixelmon['Graveler'/262, l='MpServer', x=268.50, y=69.00, z=-635.50], NPCTrainer['11'/263, l='MpServer', x=265.50, y=69.00, z=-635.50], EntityPixelmon['Slowpoke'/137, l='MpServer', x=189.50, y=68.00, z=-578.50], EntityPixelmon['Goldeen'/141, l='MpServer', x=217.55, y=53.54, z=-602.20], EntityPixelmon['Dunsparce'/147, l='MpServer', x=266.05, y=64.00, z=-549.09], EntityPixelmon['Marowak'/148, l='MpServer', x=250.77, y=63.00, z=-551.92], EntityPixelmon['Skorupi'/154, l='MpServer', x=242.73, y=68.00, z=-491.40], EntityPixelmon['Magikarp'/160, l='MpServer', x=159.64, y=58.39, z=-446.21], EntityPixelmon['Geodude'/163, l='MpServer', x=160.94, y=69.00, z=-550.06], EntityPixelmon['Magikarp'/167, l='MpServer', x=154.90, y=58.35, z=-493.50], EntityPixelmon['Geodude'/173, l='MpServer', x=161.75, y=71.00, z=-565.10], EntityPixelmon['Sigilyph'/175, l='MpServer', x=260.62, y=64.00, z=-569.38], EntityPixelmon['Graveler'/180, l='MpServer', x=290.95, y=65.00, z=-531.06], EntityPixelmon['Geodude'/182, l='MpServer', x=319.50, y=65.00, z=-477.50], EntityPixelmon['Cubone'/183, l='MpServer', x=240.50, y=65.00, z=-613.50], EntityPixelmon['Dwebble'/185, l='MpServer', x=207.44, y=65.00, z=-496.48], EntityPixelmon['Geodude'/186, l='MpServer', x=233.74, y=72.00, z=-440.08], EntityPixelmon['Geodude'/187, l='MpServer', x=304.90, y=63.00, z=-492.97], EntityPixelmon['Skorupi'/190, l='MpServer', x=210.34, y=73.00, z=-469.55], EntityPixelmon['Trapinch'/194, l='MpServer', x=251.50, y=69.00, z=-467.50], EntityPixelmon['Trapinch'/195, l='MpServer', x=244.84, y=68.00, z=-461.10], EntityPixelmon['Geodude'/196, l='MpServer', x=147.50, y=31.00, z=-624.50], EntityPixelmon['Staryu'/197, l='MpServer', x=229.50, y=49.00, z=-560.05], EntityPixelmon['Staryu'/199, l='MpServer', x=220.50, y=48.00, z=-559.50], EntityPixelmon['Zubat'/201, l='MpServer', x=205.05, y=63.50, z=-609.11], EntityPixelmon['Boldore'/208, l='MpServer', x=303.50, y=12.00, z=-487.50], EntityPixelmon['Golbat'/210, l='MpServer', x=238.21, y=42.00, z=-447.31], EntityPixelmon['Roggenrola'/211, l='MpServer', x=174.50, y=17.00, z=-466.50], EntityPixelmon['Graveler'/212, l='MpServer', x=290.79, y=64.00, z=-477.32], EntityPixelmon['Shuckle'/213, l='MpServer', x=197.50, y=56.00, z=-468.50], EntityPixelmon['Slowbro'/215, l='MpServer', x=192.82, y=68.00, z=-449.84], EntityPixelmon['Slowbro'/216, l='MpServer', x=192.00, y=66.00, z=-462.50], EntityPixelmon['Magikarp'/223, l='MpServer', x=125.97, y=58.40, z=-464.13], EntityPixelmon['Goldeen'/225, l='MpServer', x=160.68, y=53.45, z=-486.81], EntityPixelmon['Magikarp'/226, l='MpServer', x=128.17, y=58.44, z=-463.75], EntityPixelmon['Magikarp'/227, l='MpServer', x=163.41, y=58.46, z=-468.91], EntityPixelmon['Magikarp'/228, l='MpServer', x=173.50, y=58.37, z=-459.50], EntityPixelmon['Magikarp'/230, l='MpServer', x=160.20, y=58.56, z=-483.97], EntityPixelmon['Roggenrola'/232, l='MpServer', x=194.50, y=46.00, z=-523.50], EntityPixelmon['Golett'/233, l='MpServer', x=323.50, y=20.00, z=-453.50], EntityPixelmon['Graveler'/234, l='MpServer', x=200.50, y=35.00, z=-447.50], EntityPixelmon['Graveler'/236, l='MpServer', x=301.50, y=56.00, z=-498.50], EntityPixelmon['Marowak'/237, l='MpServer', x=294.50, y=64.00, z=-543.50], EntityPixelmon['Zubat'/239, l='MpServer', x=134.84, y=74.50, z=-456.42], EntityPixelmon['Zubat'/240, l='MpServer', x=200.50, y=68.50, z=-502.64], EntityPixelmon['Zubat'/241, l='MpServer', x=204.37, y=72.50, z=-476.52], EntityPixelmon['Zubat'/242, l='MpServer', x=153.90, y=72.50, z=-444.55], EntityPixelmon['Golbat'/243, l='MpServer', x=169.55, y=69.50, z=-440.40], EntityPixelmon['Klang'/244, l='MpServer', x=130.50, y=38.00, z=-568.50], EntityItem['item.tile.stonebrick'/117, l='MpServer', x=205.46, y=56.00, z=-546.98], EntityPixelmon['Trapinch'/245, l='MpServer', x=310.42, y=67.17, z=-579.94], EntityPixelmon['Trapinch'/246, l='MpServer', x=307.50, y=67.00, z=-576.50], EntityPixelmon['Jigglypuff'/247, l='MpServer', x=288.50, y=30.00, z=-456.50], EntityPixelmon['Skorupi'/248, l='MpServer', x=192.50, y=67.00, z=-460.50], EntityPixelmon['Magikarp'/249, l='MpServer', x=158.45, y=58.45, z=-493.27], EntityPixelmon['Magikarp'/250, l='MpServer', x=166.45, y=54.31, z=-479.34], EntityPixelmon['Magikarp'/251, l='MpServer', x=167.62, y=58.37, z=-474.63], EntityPixelmon['Magikarp'/252, l='MpServer', x=155.37, y=56.48, z=-505.60], EntityPixelmon['Roggenrola'/254, l='MpServer', x=283.50, y=48.00, z=-459.50], EntityPixelmon['Graveler'/255, l='MpServer', x=307.50, y=65.00, z=-459.19]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:415)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2660)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:400)
at net.minecraft.client.main.Main.main(SourceFile:124)
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.10.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_112, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 576781040 bytes (550 MB) / 1617858560 bytes (1542 MB) up to 3207856128 bytes (3059 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP 9.32 Powered by Forge 12.18.2.2151 10 mods loaded, 10 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJA mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
UCHIJA FML{8.0.99.99} [Forge Mod Loader] (forge-1.10.2-12.18.2.2151.jar)
UCHIJA Forge{12.18.2.2151} [Minecraft Forge] (forge-1.10.2-12.18.2.2151.jar)
UCHIJA mercurius_updater{1.0} [mercurius_updater] (MercuriusUpdater-1.10.2.jar)
UCHIJA pixelmon{5.0.0-beta12} [Pixelmon] (Pixelmon-1.10.2-5.0.0-beta12-universal.jar)
UCHIJA gameshark{4.2.0} [Gameshark (Pixelmon)] (Gameshark-1.10.2-4.2.0-universal.jar)
UCHIJA pixelextras{2.2.3} [Pixel Extras] (PixelExtras-1.10.2-2.2.3-universal.jar)
UCHIJA spawnofpsy{2.3.0} [SpawnOfPsyduck] (SpawnOfPsyduck-1.10.2-2.3.0-universal.jar)
UCHIJA trainercommands{2.1.3} [Pixelmon Trainer Commands] (TrainerCommands-1.10.2-2.1.3-universal.jar)
UCHIJA wondertrade{4.4.4} [Wondertrade] (WonderTrade-1.10.2-4.4.4-universal.jar)
Loaded coremods (and transformers):
GL info: ' Vendor: 'ATI Technologies Inc.' Version: '3.3.9836 Compatibility Profile Context' Renderer: 'ATI Radeon HD 4200 '
Launched Version: 1.10.2-forge1.10.2-12.18.2.2151
LWJGL: 2.9.4
OpenGL: ATI Radeon HD 4200 GL version 3.3.9836 Compatibility Profile Context, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes
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)
CPU: 2x AMD Athlon(tm) II X2 250 Processor

try using a bit more ram.

I added 4 gigs, but that didn't change anything.

Remove the gameshark mod

oh it worked now. Thanks!

It was due to this:

Description: Unexpected error

java.lang.NoClassDefFoundError: com/pixelmonmod/pixelmon/items/ItemBlock
at com.waterdude.gameshark.event.ClientEventHandler.onBlockRightClicked(ClientEventHandler.java:199)
at

Wondering if it was VBOS myself...maybe a block model not liking it.

Ask the pixelmon mod creators about updates, and ask for the fix.