MCSwordsman

Whenever I launch my pixelmon game, it will always crash. Describing this error message to me : Caused by: java.lang.ClassNotFoundException: net.minecraftforge.event.world.BlockEvent$EntityPlaceEvent 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) ... 51 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: 375821512 bytes (358 MB) / 1073741824 bytes (1024 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 14.23.5.2768 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 | State | ID | Version | Source | Signature | |:----- |:------------- |:------------ |:----------------------------------- |:---------------------------------------- | | UCHI | minecraft | 1.12.2 | minecraft.jar | None | | UCHI | mcp | 9.42 | minecraft.jar | None | | UCHI | FML | 8.0.99.99 | forge-1.12.2-14.23.5.2768.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 | | UCHI | forge | 14.23.5.2768 | forge-1.12.2-14.23.5.2768.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 | | UCHI | oreexcavation | 1.4.137 | OreExcavation-1.4.137.jar | None | | UCHEE | pixelmon | 8.0.2 | Pixelmon-1.12.2-8.0.2-universal.jar | None | Loaded coremods (and transformers): GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.6.0 NVIDIA 445.87' Renderer: 'GeForce GTX 1660 Ti/PCIe/SSE2'