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So I'm fairly new to mods, as in I literally just downloaded forge 1.8.9 and pixelmon, at first there was an issue loading it up but I easilly corrected that by allocating a bit more ram, however now it keeps telling me server tick loop or somesuch. I'm simply trying to play it in single player so I'm fairly confused as to what exactly this is or means, any and all help would be absolutely appreciated!

---- Minecraft Crash Report ----

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

// Don't do that.

Time: 11/20/16 9:19 AM
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
at com.pixelmonmod.pixelmon.entities.pixelmon.stats.Level.getExpForLevel(Level.java:121)
at com.pixelmonmod.pixelmon.entities.pixelmon.stats.Level.setLevel(Level.java:98)
at com.pixelmonmod.pixelmon.entities.npcs.NPCTrainer.initializePokemon(NPCTrainer.java:447)
at com.pixelmonmod.pixelmon.entities.npcs.NPCTrainer.loadPokemon(NPCTrainer.java:431)
at com.pixelmonmod.pixelmon.entities.npcs.NPCTrainer.init(NPCTrainer.java:176)
at com.pixelmonmod.pixelmon.listener.spawn.ReplaceMCVillagers.onVillagerSpawn(ReplaceMCVillagers.java:30)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_41_ReplaceMCVillagers_onVillagerSpawn_EntityJoinWorldEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:49)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at net.minecraft.world.World.func_72838_d(World.java:1122)
at net.minecraft.world.gen.structure.StructureVillagePieces$Village.func_74893_a(StructureVillagePieces.java:1618)
at net.minecraft.world.gen.structure.StructureVillagePieces$House3.func_74875_a(StructureVillagePieces.java:1106)
at net.minecraft.world.gen.structure.StructureStart.func_75068_a(StructureStart.java:46)
at net.minecraft.world.gen.structure.MapGenStructure.func_175794_a(MapGenStructure.java:86)
at net.minecraft.world.gen.ChunkProviderGenerate.func_73153_a(ChunkProviderGenerate.java:401)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:261)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1054)
at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:172)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:114)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:84)
at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:307)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:109)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:123)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:441)
at java.lang.Thread.run(Thread.java:745)

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

-- System Details --
Details:
Minecraft Version: 1.8.9
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1275724264 bytes (1216 MB) / 2837282816 bytes (2705 MB) up to 3094609920 bytes (2951 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn1208M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP 9.19 Powered by Forge 11.15.1.1902 4 mods loaded, 4 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAA mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAA FML{8.0.99.99} [Forge Mod Loader] (forge-1.8.9-11.15.1.1902-1.8.9.jar)
UCHIJAA Forge{11.15.1.1902} [Minecraft Forge] (forge-1.8.9-11.15.1.1902-1.8.9.jar)
UCHIJAA pixelmon{4.2.7} [Pixelmon] (Pixelmon-1.8.9-4.2.7-universal.jar)
Loaded coremods (and transformers):
Java8CheckerCoremod (Pixelmon-1.8.9-4.2.7-universal.jar)

GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'