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Hello, I'm trying to play Minecraft in a server with my friend but this error occurs and crashes my game after a few seconds of entering the server. This is the crash report I received:

---- Minecraft Crash Report -------- Minecraft Crash Report ----
WARNING: coremods are present: MicdoodlePlugin (MicdoodleCore-1.12.2.jar) llibrary (llibrary-1.7.9-1.12.2.jar) LucraftCoreCoreMod (LucraftCore-1.12.2-2.3.2.jar)Contact their authors BEFORE contacting forge
// Who set us up the TNT?
Time: 11/25/18 12:38 PMDescription: Ticking entity
java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Boolean at drzhark.mocreatures.entity.MoCEntityTameableAquatic.getIsTamed(MoCEntityTameableAquatic.java:89) at drzhark.mocreatures.entity.MoCEntityTameableAquatic.func_70094_T(MoCEntityTameableAquatic.java:452) at net.minecraft.entity.EntityLivingBase.func_70030_z(EntityLivingBase.java:232) at net.minecraft.entity.EntityLiving.func_70030_z(EntityLiving.java:269) at drzhark.mocreatures.entity.MoCEntityAquatic.func_70030_z(MoCEntityAquatic.java:914) at net.minecraft.entity.Entity.func_70071_h_(Entity.java:389) at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2089) at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:377) at net.minecraft.world.World.func_72866_a(World.java:1993) at net.minecraft.world.World.func_72870_g(World.java:1955) at net.minecraft.world.World.func_72939_s(World.java:1759) at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1846) at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1097) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:397) at net.minecraft.client.main.Main.main(SourceFile:123) 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:497) 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 --Thread: Client threadStacktrace: at drzhark.mocreatures.entity.MoCEntityTameableAquatic.getIsTamed(MoCEntityTameableAquatic.java:89) at drzhark.mocreatures.entity.MoCEntityTameableAquatic.func_70094_T(MoCEntityTameableAquatic.java:452) at net.minecraft.entity.EntityLivingBase.func_70030_z(EntityLivingBase.java:232) at net.minecraft.entity.EntityLiving.func_70030_z(EntityLiving.java:269) at drzhark.mocreatures.entity.MoCEntityAquatic.func_70030_z(MoCEntityAquatic.java:914) at net.minecraft.entity.Entity.func_70071_h_(Entity.java:389) at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2089) at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:377) at net.minecraft.world.World.func_72866_a(World.java:1993) at net.minecraft.world.World.func_72870_g(World.java:1955)
-- Entity being ticked --Details: Entity Type: mocreatures:salmon (drzhark.mocreatures.entity.aquatic.MoCEntitySalmon) Entity ID: 254 Entity Name: Salmon Entity's Exact location: -156.50, 63.00, 297.50 Entity's Block location: World: (-157,63,297), Chunk: (at 3,3,9 in -10,18; contains blocks -160,0,288 to -145,255,303), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511) Entity's Momentum: 0.00, 0.00, 0.00 Entity's Passengers: [] Entity's Vehicle: ~~ERROR~~ NullPointerException: nullStacktrace: at net.minecraft.world.World.func_72939_s(World.java:1759)
-- Affected level --Details: Level name: MpServer All players: 1 total; [EntityPlayerSP['Periclork'/250, l='MpServer', x=-106.50, y=89.00, z=257.50]] Chunk stats: MultiplayerChunkCache: 441, 441 Level seed: 0 Level generator: ID 00 - default, ver 1. Features enabled: false Level generator options: Level spawn location: World: (-108,64,256), Chunk: (at 4,4,0 in -7,16; contains blocks -112,0,256 to -97,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511) Level time: 7332 game time, 7332 day time Level dimension: 0 Level storage version: 0x00000 - Unknown? Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false) Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false Forced entities: 92 total; [EntityPlayerSP['Periclork'/250, l='MpServer', x=-106.50, y=89.00, z=257.50], EntitySkeleton['Skeleton'/128, l='MpServer', x=-105.55, y=49.00, z=223.24], EntityLatchedRenderer['unknown'/1, l='MpServer', x=-106.50, y=89.00, z=257.50], EntitySkeleton['Skeleton'/129, l='MpServer', x=-107.75, y=15.00, z=242.50], EntityCreeper['Creeper'/130, l='MpServer', x=-100.50, y=17.00, z=249.50], EntitySkeleton['Skeleton'/131, l='MpServer', x=-103.50, y=14.00, z=260.50], EntitySpider['Spider'/132, l='MpServer', x=-103.50, y=14.00, z=258.50], MoCEntityButterfly['ButterFly'/133, l='MpServer', x=-98.10, y=74.00, z=303.90], MoCEntityBunny['Bunny'/134, l='MpServer', x=-95.48, y=76.00, z=302.55], MoCEntityCricket['Cricket'/135, l='MpServer', x=-100.47, y=70.00, z=336.39], EntityZombie['Zombie'/146, l='MpServer', x=-86.50, y=16.00, z=202.50], EntitySheep['Sheep'/147, l='MpServer', x=-82.29, y=69.00, z=199.49], EntityCreeper['Creeper'/148, l='MpServer', x=-85.79, y=15.00, z=227.53], EntitySheep['Sheep'/149, l='MpServer', x=-93.50, y=77.00, z=300.50], EntitySheep['Sheep'/150, l='MpServer', x=-86.51, y=82.00, z=307.21], EntitySheep['Sheep'/151, l='MpServer', x=-94.50, y=82.00, z=292.73], EntitySheep['Sheep'/152, l='MpServer', x=-92.50, y=78.00, z=299.45], EntityZombie['Zombie'/153, l='MpServer', x=-90.50, y=43.00, z=306.50], MoCEntityBunny['Bunny'/154, l='MpServer', x=-92.50, y=79.00, z=311.50], MoCEntityBunny['Bunny'/155, l='MpServer', x=-97.47, y=75.00, z=303.51], EntitySheep['Sheep'/159, l='MpServer', x=-80.35, y=70.00, z=203.23], EntitySheep['Sheep'/160, l='MpServer', x=-76.50, y=67.00, z=194.50], EntitySheep['Sheep'/161, l='MpServer', x=-75.50, y=68.00, z=194.50], MoCEntityFox['Fox'/162, l='MpServer', x=-68.50, y=76.00, z=214.50], EntityCreeper['Creeper'/163, l='MpServer', x=-74.50, y=36.00, z=227.50], MoCEntityBlackBear['BlackBear'/164, l='MpServer', x=-69.50, y=71.00, z=255.50], MoCEntityDuck['Duck'/165, l='MpServer', x=-65.50, y=77.00, z=310.50], MoCEntityDuck['Duck'/166, l='MpServer', x=-67.50, y=77.00, z=311.50], EntityZombie['Zombie'/167, l='MpServer', x=-70.50, y=69.00, z=313.50], EntityCreeper['Creeper'/43, l='MpServer', x=-181.50, y=56.00, z=235.50], MoCEntityFirefly['Firefly'/44, l='MpServer', x=-179.06, y=68.00, z=262.49], MoCEntityBird['Bird'/46, l='MpServer', x=-179.65, y=67.00, z=296.80], EntityZombie['Zombie'/174, l='MpServer', x=-60.50, y=79.00, z=182.50], EntitySheep['Sheep'/175, l='MpServer', x=-63.50, y=89.00, z=178.55], MoCEntityBird['Bird'/48, l='MpServer', x=-184.95, y=74.00, z=335.97], EntitySheep['Sheep'/177, l='MpServer', x=-60.50, y=96.00, z=177.50], MoCEntityButterfly['ButterFly'/49, l='MpServer', x=-181.75, y=70.00, z=327.38], EntitySpider['Spider'/178, l='MpServer', x=-48.28, y=20.00, z=202.30], EntityZombie['Zombie'/179, l='MpServer', x=-51.50, y=19.00, z=198.50], EntityZombie['Zombie'/180, l='MpServer', x=-49.50, y=18.00, z=199.50], EntitySkeleton['Skeleton'/181, l='MpServer', x=-53.53, y=23.00, z=205.27], EntityCreeper['Creeper'/182, l='MpServer', x=-60.50, y=22.00, z=244.50], MoCEntityFly['Fly'/183, l='MpServer', x=-51.11, y=64.00, z=259.33], EntitySkeleton['Skeleton'/55, l='MpServer', x=-175.21, y=18.00, z=299.52], MoCEntityButterfly['ButterFly'/184, l='MpServer', x=-50.49, y=67.00, z=292.10], MoCEntitySnake['Snake'/56, l='MpServer', x=-161.99, y=63.00, z=318.69], MoCEntityRat['Rat'/185, l='MpServer', x=-49.50, y=66.00, z=311.50], MoCEntitySnake['Snake'/57, l='MpServer', x=-160.89, y=64.00, z=332.90], EntitySheep['Sheep'/190, l='MpServer', x=-32.01, y=70.00, z=237.70], EntitySheep['Sheep'/191, l='MpServer', x=-36.50, y=71.00, z=234.50], EntitySheep['Sheep'/192, l='MpServer', x=-33.96, y=91.00, z=232.45], EntitySheep['Sheep'/193, l='MpServer', x=-35.25, y=90.00, z=233.61], MoCEntityButterfly['ButterFly'/194, l='MpServer', x=-44.50, y=66.00, z=296.90], MoCEntityDeer['Deer'/67, l='MpServer', x=-159.63, y=73.00, z=190.55], EntityCreeper['Creeper'/68, l='MpServer', x=-149.50, y=59.00, z=269.50], MoCEntityWerewolf['Werewolf'/69, l='MpServer', x=-146.53, y=59.00, z=266.84], EntityCreeper['Creeper'/70, l='MpServer', x=-154.18, y=59.00, z=277.42], EntitySkeleton['Skeleton'/198, l='MpServer', x=-27.50, y=33.00, z=332.50], EntityZombieVillager['Zombie Villager'/71, l='MpServer', x=-155.50, y=12.00, z=308.50], EntitySquid['Squid'/72, l='MpServer', x=-151.58, y=62.23, z=311.96], EntitySquid['Squid'/73, l='MpServer', x=-152.73, y=61.76, z=313.11], EntityZombie['Zombie'/75, l='MpServer', x=-141.50, y=27.00, z=251.50], EntitySkeleton['Skeleton'/76, l='MpServer', x=-134.50, y=42.00, z=245.50], EntitySkeleton['Skeleton'/77, l='MpServer', x=-134.50, y=42.00, z=248.50], EntityCreeper['Creeper'/78, l='MpServer', x=-143.50, y=45.00, z=264.50], EntitySkeleton['Skeleton'/79, l='MpServer', x=-132.30, y=19.00, z=279.52], EntityCreeper['Creeper'/80, l='MpServer', x=-130.50, y=19.00, z=277.50], MoCEntityFly['Fly'/81, l='MpServer', x=-139.43, y=77.00, z=297.47], EntitySkeleton['Skeleton'/94, l='MpServer', x=-112.50, y=16.00, z=188.50], EntityZombie['Zombie'/95, l='MpServer', x=-115.50, y=17.00, z=193.22], EntitySkeleton['Skeleton'/97, l='MpServer', x=-115.50, y=18.00, z=195.50], EntityZombie['Zombie'/98, l='MpServer', x=-113.70, y=24.00, z=195.70], EntityCreeper['Creeper'/99, l='MpServer', x=-114.50, y=24.00, z=212.50], EntityCreeper['Creeper'/100, l='MpServer', x=-118.19, y=22.00, z=219.56], EntitySkeleton['Skeleton'/101, l='MpServer', x=-123.27, y=35.00, z=221.47], EntitySpider['Spider'/102, l='MpServer', x=-115.50, y=33.00, z=218.40], EntityCreeper['Creeper'/103, l='MpServer', x=-113.50, y=33.00, z=216.50], MoCEntityBunny['Bunny'/104, l='MpServer', x=-116.50, y=66.00, z=223.50], MoCEntityBunny['Bunny'/105, l='MpServer', x=-115.50, y=65.00, z=223.50], EntityCreeper['Creeper'/106, l='MpServer', x=-121.53, y=23.00, z=306.35], EntityZombie['Zombie'/115, l='MpServer', x=-109.50, y=25.00, z=191.50], MoCEntitySilverSkeleton['SilverSkeleton'/116, l='MpServer', x=-97.50, y=40.00, z=182.50], MoCEntityWerewolf['Werewolf'/118, l='MpServer', x=-106.33, y=45.00, z=186.47], EntityCreeper['Creeper'/119, l='MpServer', x=-107.50, y=18.00, z=203.50], EntityCreeper['Creeper'/120, l='MpServer', x=-103.57, y=18.00, z=197.80], EntityZombie['Zombie'/121, l='MpServer', x=-106.50, y=18.00, z=207.50], EntitySkeleton['Skeleton'/123, l='MpServer', x=-110.80, y=31.00, z=220.27], EntityItem['item.item.fish.cod.raw'/124, l='MpServer', x=-106.60, y=31.00, z=213.70], EntityItem['item.item.fish.cod.raw'/125, l='MpServer', x=-105.33, y=31.00, z=213.21], EntityItem['item.item.fish.cod.raw'/126, l='MpServer', x=-105.54, y=31.00, z=211.27], MoCEntitySalmon['Salmon'/254, l='MpServer', x=-156.50, y=63.00, z=297.50], EntityItem['item.item.fish.cod.raw'/127, l='MpServer', x=-108.92, y=31.00, z=212.67]] Retry entities: 0 total; [] Server brand: fml,forge Server type: Non-integrated multiplayer serverStacktrace: at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:532) at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2740) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:418) at net.minecraft.client.main.Main.main(SourceFile:123) 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:497) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
-- 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: 621675320 bytes (592 MB) / 1778384896 bytes (1696 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: 13, tallocated: 95 FML: MCP 9.42 Powered by Forge 14.23.5.2768 Optifine OptiFine_1.12.2_HD_U_D1 32 mods loaded, 32 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 | |:------ |:----------------- |:-------------- |:--------------------------------------------- |:---------------------------------------- | | UCHIJA | minecraft | 1.12.2 | minecraft.jar | None | | UCHIJA | mcp | 9.42 | minecraft.jar | None | | UCHIJA | FML | 8.0.99.99 | forge-1.12.2-14.23.5.2768.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 | | UCHIJA | forge | 14.23.5.2768 | forge-1.12.2-14.23.5.2768.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 | | UCHIJA | micdoodlecore | | minecraft.jar | None | | UCHIJA | aether_legacy | 1.12.2-v3.2 | aether_legacy-1.12.2-v3.2.jar | None | | UCHIJA | xaerobetterpvp | 1.15.9 | BetterPvP_1.15.9_Forge_1.12.jar | None | | UCHIJA | bibliocraft | 2.4.5 | BiblioCraft[v2.4.5][MC1.12.2].jar | None | | UCHIJA | biomesoplenty | 7.0.1.2361 | BiomesOPlenty-1.12.2-7.0.1.2361-universal.jar | None | | UCHIJA | codechickenlib | 3.2.2.353 | CodeChickenLib-1.12.2.jar | f1850c39b2516232a2108a7bd84d1cb5df93b261 | | UCHIJA | extendedrenderer | v1.0 | CoroUtil-1.12.2.jar | None | | UCHIJA | coroutil | 1.12.1-1.2.14 | CoroUtil-1.12.2.jar | None | | UCHIJA | configmod | v1.0 | CoroUtil-1.12.2.jar | None | | UCHIJA | llibrary | 1.7.9 | llibrary-1.7.9-1.12.2.jar | None | | UCHIJA | dragonmounts | 1.12.2-1.4.8.8 | DragonMounts-1.12.2-1.4.8.8.jar | None | | UCHIJA | galacticraftcore | 4.0.1.181 | Galacticraft-Mod-1.12.2.jar | None | | UCHIJA | ichunutil | 7.1.0 | iChunUtil-1.12.2-7.1.0.jar | None | | UCHIJA | jei | 4.12.0.216 | jei_1.12.2-4.12.0.216.jar | None | | UCHIJA | speedsterheroes | 1.12.2-2.0.7 | Quicksilver-Mod-1.12.2.jar | None | | UCHIJA | lucraftcore | 1.12.2-2.3.2 | LucraftCore-1.12.2-2.3.2.jar | None | | UCHIJA | radixcore | 1.12.x-2.2.1 | RadixCore-1.12.2.jar | None | | UCHIJA | mca | 1.12.2-5.3.1 | Minecraft-Comes-Alive-Mod-1.12.2.jar | None | | UCHIJA | mocreatures | 12.0.5 | Mo-Creatures-Mod-1.12.2.jar | None | | UCHIJA | movinglightsource | 1.0.15 | movinglightsource-1.12.2-1.0.15.jar | None | | UCHIJA | portalgun | 7.0.2 | Portal-Gun-Mod-1.12.2.jar | None | | UCHIJA | switchbow | 1.5 | Switch-Bow-Mod-1.12.2.jar | None | | UCHIJA | torohealthmod | 1.12.2-11 | torohealth-1.12.2-11.jar | None | | UCHIJA | bspkrscore | at_0.9 | TreeCapitator-Mod-1.12.jar | None | | UCHIJA | treecapitator | at_0.9 | TreeCapitator-Mod-1.12.jar | None | | UCHIJA | twilightforest | 3.7.424 | Twilight-Forest-Mod-1.12.2.jar | None | | UCHIJA | wearablebackpacks | 3.1.0 | Wearable-Backpacks-Mod-1.12.2.jar | None | | UCHIJA | weather2 | 1.12.1-2.6.12 | Weather-Storms-Tornadoes-Mod-1.12.2.jar | None |
Loaded coremods (and transformers): MicdoodlePlugin (MicdoodleCore-1.12.2.jar) micdoodle8.mods.miccore.MicdoodleTransformerllibrary (llibrary-1.7.9-1.12.2.jar) net.ilexiconn.llibrary.server.core.plugin.LLibraryTransformer net.ilexiconn.llibrary.server.core.patcher.LLibraryRuntimePatcherLucraftCoreCoreMod (LucraftCore-1.12.2-2.3.2.jar) lucraft.mods.lucraftcore.core.LCTransformer GL info: ' Vendor: 'Intel' Version: '4.5.0 - Build 23.20.16.4973' Renderer: 'Intel(R) UHD Graphics 630' Launched Version: 1.12.2-forge1.12.2-14.23.5.2768 LWJGL: 2.9.4 OpenGL: Intel(R) UHD Graphics 630 GL version 4.5.0 - Build 23.20.16.4973, Intel GL Caps: Using GL 1.3 multitexturing.Using GL 1.3 texture combiners.Using framebuffer objects because OpenGL 3.0 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: Yes 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: 8x Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz OptiFine Version: OptiFine_1.12.2_HD_U_D1 OptiFine Build: 20180323-135452 Render Distance Chunks: 16 Mipmaps: 4 Anisotropic Filtering: 1 Antialiasing: 0 Multitexture: false Shaders: null OpenGlVersion: 4.5.0 - Build 23.20.16.4973 OpenGlRenderer: Intel(R) UHD Graphics 630 OpenGlVendor: Intel CpuCount: 8

Remove that entity and try again:

Entity Type: mocreatures:salmon (drzhark.mocreatures.entity.aquatic.MoCEntitySalmon) Entity ID: 254 Entity Name: Salmon Entity's Exact location: -156.50, 63.00, 297.50 Entity's Block location: World: (-157,63,297)

Ok, but how would I remove the entity? I'm guessing I'll have to use another program of some sort?

Use MCEdit.

Get MCEdit here: http://www.mcedit.net/

I'll try that and remove the entity, thanks!