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I was hoping to get some feedback and help with my Pixelmon experience, because everutime I attempt to place a PC or a healer, the game crashes. I have the crashlog for those of you who can help me:

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 8/14/16 12:42 PM
Description: Exception in server tick loop

java.lang.NoSuchMethodError: net.minecraftforge.event.world.BlockEvent.access$000()Z
at net.minecraftforge.event.world.BlockEvent$PlaceEvent.<init>(BlockEvent.java:143)
at com.pixelmonmod.pixelmon.items.ItemBlock.canPlaceHeight(ItemBlock.java:143)
at com.pixelmonmod.pixelmon.items.ItemBlock.canPlaceLength(ItemBlock.java:122)
at com.pixelmonmod.pixelmon.items.ItemBlock.canPlace(ItemBlock.java:98)
at com.pixelmonmod.pixelmon.items.ItemBlock.onItemUseFirst(ItemBlock.java:63)
at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:360)
at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:554)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.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.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Mac OS X (x86_64) version 10.10.5
Java Version: 1.8.0_74, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 430031616 bytes (410 MB) / 1078132736 bytes (1028 MB) up to 2134114304 bytes (2035 MB)
JVM Flags: 5 total; -Xmx2G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP v9.05 FML v7.10.82.1215 Minecraft Forge 10.13.1.1215 4 mods loaded, 4 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.10.82.1215} [Forge Mod Loader] (forge-1.7.10-10.13.1.1215-new.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.13.1.1215} [Minecraft Forge] (forge-1.7.10-10.13.1.1215-new.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
pixelmon{3.5.0} [Pixelmon] (Pixelmon-1.7.10-3.5.1-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['DJoker39PlaysMC'/40, l='Pixel Play', x=-156.85, y=85.00, z=77.11]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'