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Whenever i try to play, the game loads up fine, and everything seems normal. However, as soon as i attempt to load a world, the game crashes. The crash report is down below

---- Minecraft Crash Report ----

WARNING: coremods are present:
Java8CheckerCoremod (Pixelmon-1.8.9-4.2.7-universal.jar)
Contact their authors BEFORE contacting forge

// Ouch. That hurt

Time: 7/30/16 2:15 PM
Description: Updating screen events

java.lang.IllegalMonitorStateException
at net.minecraft.client.Minecraft.func_152348_aa(Minecraft.java:2923)
at net.minecraft.client.gui.GuiScreen.func_146282_l(GuiScreen.java:580)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:533)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1674)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1024)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:349)
at net.minecraft.client.main.Main.main(SourceFile:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
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 net.minecraft.client.Minecraft.func_152348_aa(Minecraft.java:2923)
at net.minecraft.client.gui.GuiScreen.func_146282_l(GuiScreen.java:580)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:533)

-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.GuiMainMenu
Stacktrace:
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1674)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1024)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:349)
at net.minecraft.client.main.Main.main(SourceFile:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.8.9
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 703552392 bytes (670 MB) / 1860698112 bytes (1774 MB) up to 1908932608 bytes (1820 MB)
JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -XX:MaxPermSize=128m -Xmx2048M -Xms256M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP 9.19 Powered by Forge 11.15.1.1722 6 mods loaded, 6 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{8.0.99.99} [Forge Mod Loader] (forge-1.8.9-11.15.1.1722.jar)
UCHIJAAAA Forge{11.15.1.1722} [Minecraft Forge] (forge-1.8.9-11.15.1.1722.jar)
UCHIJAAAA BiomesOPlenty{3.0.0} [Biomes O' Plenty] (BiomesOPlenty-1.8.9-3.0.0.1935-universal.jar)
UCHIJAAAA pixelmon{4.2.7} [Pixelmon] (Pixelmon-1.8.9-4.2.7-universal.jar)
UCHIJAAAA spawnofpsy{2.1.2} [SpawnOfPsyduck] (SpawnOfPsyduck-1.8.9-2.1.2-universal.jar)
Loaded coremods (and transformers):
Java8CheckerCoremod (Pixelmon-1.8.9-4.2.7-universal.jar)

GL info: ' Vendor: 'Intel' Version: '2.1.0 - Build 8.15.10.2900' Renderer: 'Intel(R) HD Graphics'
Launched Version: 1.8.9-forge1.8.9-11.15.1.1722
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics GL version 2.1.0 - Build 8.15.10.2900, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object 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: No
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: 4x Intel(R) Core(TM) i3 CPU 540 @ 3.07GHz

If anyone has any insight on this, please help me. I am illiterate when it comes to reading these, but i love the mod and just want to play.