my minecraft closes while trying to create/load a world of minecraft pixelmon

The game crashed whilst exception in server tick loop
Error: java.lang.NoClassDefFoundError: com/pixelmonmod/pixelmon/enums/EnumPokemon

 

 

---- Minecraft Crash Report ----

// Don't be sad, have a hug! ❤️

Time: 8/19/19 8:38 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: com/pixelmonmod/pixelmon/enums/EnumPokemon
    at com.wondertrademod.wondertrade.WondertradeManager.getRandomEntityPixelmon(WondertradeManager.java:152)
    at com.wondertrademod.wondertrade.WondertradeManager.generateRandomPool(WondertradeManager.java:134)
    at com.wondertrademod.wondertrade.WondertradeManager.initializePool(WondertradeManager.java:45)
    at com.wondertrademod.wondertrade.WondertradeManager.onWorldTick(WondertradeManager.java:53)
    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_65_WondertradeManager_onWorldTick_WorldTickEvent.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.onPreWorldTick(FMLCommonHandler.java:286)
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:752)
    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)
Caused by: java.lang.ClassNotFoundException: com.pixelmonmod.pixelmon.enums.EnumPokemon
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 13 more
Caused by: java.lang.NullPointerException

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

-- 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: 456007528 bytes (434 MB) / 1308622848 bytes (1248 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: 0, tallocated: 0
    FML: MCP 9.42 Powered by Forge 14.23.4.2705 8 mods loaded, 8 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                                |
    |:--------- |:----------- |:------------ |:--------------------------------------- |:---------------------------------------- |
    | UCHIJAAAA | minecraft   | 1.12.2       | minecraft.jar                           | None                                     |
    | UCHIJAAAA | mcp         | 9.42         | minecraft.jar                           | None                                     |
    | UCHIJAAAA | FML         | 8.0.99.99    | forge-1.12.2-14.23.4.2705.jar           | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | UCHIJAAAA | forge       | 14.23.4.2705 | forge-1.12.2-14.23.4.2705.jar           | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | UCHIJAAAA | jei         | 4.10.0.198   | jei_1.12.2-4.10.0.198.jar               | None                                     |
    | UCHIJAAAA | journeymap  | 1.12.2-5.5.2 | journeymap-1.12.2-5.5.2.jar             | None                                     |
    | UCHIJAAAA | pixelmon    | 7.0.6        | Pixelmon-1.12.2-7.0.6-universal.jar     | None                                     |
    | UCHIJAAAA | wondertrade | 4.5.0        | WonderTrade-1.12.2-4.5.3b-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: 0 / 8; []
    Type: Integrated Server (map_client.txt)
    Is Modded: Definitely; Client brand changed to 'fml,forge'

You should ask Pixelmon questions in the Pixelmon Discord (https://pixelmonmod.com/discord) but the issue here is that WonderTrade needs to be updated