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i am having trouble going to any pixelmon server at all i have not been able to go to any i can only play singleplayer minecraft? is there anything i can do to fix it?

Post the crash report.

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 1/18/19 3:53 PM
Description: Ticking memory connection

java.lang.ArrayIndexOutOfBoundsException: 10
at java.util.ArrayList.indexOf(ArrayList.java:317)
at java.util.ArrayList.contains(ArrayList.java:300)
at agp.andwhat5.PlayerCheck.isDeveloper(PlayerCheck.java:91)
at agp.andwhat5.PlayerCheck.onPlayerJoin(PlayerCheck.java:102)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_125_PlayerCheck_onPlayerJoin_PlayerLoggedInEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.fml.common.FMLCommonHandler.firePlayerLoggedIn(FMLCommonHandler.java:575)
at net.minecraft.server.management.PlayerList.initializeConnectionToPlayer(PlayerList.java:219)
at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.completeServerSideConnection(NetworkDispatcher.java:255)
at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.access$100(NetworkDispatcher.java:72)
at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_73660_a(NetworkDispatcher.java:205)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:285)
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:180)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:790)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Thread.java:745)

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

-- Head --
Thread: Server thread
Stacktrace:
at java.util.ArrayList.indexOf(ArrayList.java:317)
at java.util.ArrayList.contains(ArrayList.java:300)
at agp.andwhat5.PlayerCheck.isDeveloper(PlayerCheck.java:91)
at agp.andwhat5.PlayerCheck.onPlayerJoin(PlayerCheck.java:102)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_125_PlayerCheck_onPlayerJoin_PlayerLoggedInEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.fml.common.FMLCommonHandler.firePlayerLoggedIn(FMLCommonHandler.java:575)
at net.minecraft.server.management.PlayerList.initializeConnectionToPlayer(PlayerList.java:219)
at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.completeServerSideConnection(NetworkDispatcher.java:255)
at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.access$100(NetworkDispatcher.java:72)
at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_73660_a(NetworkDispatcher.java:205)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:285)

-- Ticking connection --
Details:
Connection: [email protected]
Stacktrace:
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:180)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:790)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 737915056 bytes (703 MB) / 1174405120 bytes (1120 MB) up to 2147483648 bytes (2048 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP 9.42 Powered by Forge 14.23.5.2796 12 mods loaded, 12 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

| State | ID | Version | Source | Signature |
|:------ |:--------------- |:------------ |:------------------------------------------ |:---------------------------------------- |
| LCHIJA | minecraft | 1.12.2 | minecraft.jar | None |
| LCHIJA | mcp | 9.42 | minecraft.jar | None |
| LCHIJA | FML | 8.0.99.99 | forge-1.12.2-14.23.5.2796.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCHIJA | forge | 14.23.5.2796 | forge-1.12.2-14.23.5.2796.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCHIJA | pixelmon | 6.3.4 | Pixelmon-1.12.2-6.3.4-universal.jar | None |
| LCHIJA | agp | 0.5.5-Beta | AnotherGymPlugin-1.12.2-0.5.5-beta.jar | None |
| LCHIJA | jei | 4.13.1.225 | jei_1.12.2-4.13.1.225.jar | None |
| LCHIJA | journeymap | 1.12.2-5.5.3 | journeymap-1.12.2-5.5.3.jar | None |
| LCHIJA | pixelextras | 2.3.10 | PixelExtras-1.12.2-2.3.10-universal.jar | None |
| LCHIJA | safeplace | 2.3.0 | SafePlace-1.12.2-2.4.0.jar | None |
| LCHIJA | trainercommands | 2.4.1 | TrainerCommands-1.12.2-2.4.1-universal.jar | None |
| LCHIJA | wondertrade | 4.5.4 | WonderTrade-1.12.2-4.5.4-universal.jar | None |

Loaded coremods (and transformers):
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [EntityPlayerMP['kpopingurl2018'/124, l='Pixelmon', x=266.24, y=78.00, z=91.38]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

You never mentioned it was about pixelmon. So what you wanted to say was, you cannot join any pixelmon servers?

yes sry it works with vanilla minecraft