1.12.2 doesnt work at all

[Kayanchi]

Hello,
I have many problems with the 1.12.2 flans mod:
-Some wepons crash the game if held in hand Examples: MP7
-The Sentry Gun spawns 2 blocks above ground
-Many moddels are "special" Examples: Leopard tank, WW2 handgrenade
-I cant shoot as the driver the mg/secondary wepon (I tried left click, right click and b)

[Kayanchi]

This is a crash report from a wepon moddel:
---- Minecraft Crash Report ----
// Sorry :(

Time: 11/19/20 1:43 PM
Description: Unexpected error

java.lang.IndexOutOfBoundsException
at java.nio.Buffer.checkIndex(Buffer.java:544)
at java.nio.DirectByteBuffer.get(DirectByteBuffer.java:262)
at org.lwjgl.input.Keyboard.isKeyDown(Keyboard.java:407)
at com.flansmod.client.ClientEventHandler.CheckForOffHandWeaponSwitch(ClientEventHandler.java:128)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_66_ClientEventHandler_CheckForOffHandWeaponSwitch_MouseEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
at net.minecraftforge.client.ForgeHooksClient.postMouseEvent(ForgeHooksClient.java:245)
at net.minecraft.client.Minecraft.func_184124_aB(Minecraft.java:2273)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1798)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1096)
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:498)
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 thread
Stacktrace:
at java.nio.Buffer.checkIndex(Buffer.java:544)
at java.nio.DirectByteBuffer.get(DirectByteBuffer.java:262)
at org.lwjgl.input.Keyboard.isKeyDown(Keyboard.java:407)
at com.flansmod.client.ClientEventHandler.CheckForOffHandWeaponSwitch(ClientEventHandler.java:128)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_66_ClientEventHandler_CheckForOffHandWeaponSwitch_MouseEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
at net.minecraftforge.client.ForgeHooksClient.postMouseEvent(ForgeHooksClient.java:245)
at net.minecraft.client.Minecraft.func_184124_aB(Minecraft.java:2273)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityPlayerSP['Kayanosenpai'/2394, l='MpServer', x=117.76, y=71.00, z=260.43]]
Chunk stats: MultiplayerChunkCache: 525, 525
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (120,64,248), Chunk: (at 8,4,8 in 7,15; contains blocks 112,0,240 to 127,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 2266 game time, 2266 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: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 109 total; [EntityItem['item.tile.sapling.oak'/6144, l='MpServer', x=157.66, y=71.00, z=286.94], EntityCreeper['Creeper'/6157, l='MpServer', x=112.50, y=42.00, z=213.50], EntityCreeper['Creeper'/6160, l='MpServer', x=94.50, y=28.00, z=239.50], EntityCreeper['Creeper'/6161, l='MpServer', x=48.50, y=18.00, z=306.50], EntityBat['Bat'/6173, l='MpServer', x=38.42, y=25.35, z=184.15], EntityBat['Bat'/6174, l='MpServer', x=98.46, y=25.00, z=303.36], EntitySpider['Spider'/6190, l='MpServer', x=39.50, y=25.00, z=186.50], EntityCow['Cow'/56, l='MpServer', x=47.50, y=66.00, z=259.50], EntityCow['Cow'/57, l='MpServer', x=49.59, y=64.00, z=264.20], EntityCow['Cow'/58, l='MpServer', x=51.50, y=66.00, z=255.50], EntityCow['Cow'/59, l='MpServer', x=49.78, y=67.00, z=247.59], EntityPig['Pig'/60, l='MpServer', x=43.50, y=67.00, z=260.26], EntityPig['Pig'/61, l='MpServer', x=42.50, y=67.00, z=256.50], EntityPig['Pig'/62, l='MpServer', x=40.50, y=67.00, z=257.50], EntityPig['Pig'/63, l='MpServer', x=44.50, y=67.00, z=259.50], EntityCow['Cow'/64, l='MpServer', x=83.50, y=75.00, z=326.50], EntityCow['Cow'/65, l='MpServer', x=76.45, y=78.00, z=324.55], EntityCow['Cow'/66, l='MpServer', x=78.81, y=78.00, z=325.45], EntityCow['Cow'/67, l='MpServer', x=77.56, y=78.00, z=324.55], EntityHorse['Horse'/72, l='MpServer', x=117.50, y=64.00, z=309.50], EntityHorse['Horse'/73, l='MpServer', x=117.50, y=64.00, z=309.50], EntityHorse['Horse'/74, l='MpServer', x=114.50, y=67.00, z=305.50], EntityHorse['Horse'/78, l='MpServer', x=142.30, y=65.00, z=225.71], EntityHorse['Horse'/79, l='MpServer', x=146.01, y=65.00, z=232.61], EntityHorse['Horse'/80, l='MpServer', x=138.93, y=65.00, z=236.07], EntityHorse['Horse'/81, l='MpServer', x=141.12, y=65.00, z=226.85], EntityPig['Pig'/82, l='MpServer', x=131.34, y=64.00, z=231.51], EntityPig['Pig'/83, l='MpServer', x=130.49, y=69.12, z=242.66], EntityPig['Pig'/84, l='MpServer', x=120.78, y=72.00, z=253.50], EntityPig['Pig'/85, l='MpServer', x=143.22, y=66.00, z=239.49], EntityHorse['Horse'/86, l='MpServer', x=126.00, y=65.00, z=290.23], EntityHorse['Horse'/87, l='MpServer', x=125.30, y=65.00, z=289.06], EntityCow['Cow'/88, l='MpServer', x=131.50, y=63.00, z=334.50], EntityChicken['Chicken'/90, l='MpServer', x=136.50, y=64.00, z=303.50], EntityChicken['Chicken'/91, l='MpServer', x=137.50, y=64.00, z=307.50], EntityChicken['Chicken'/92, l='MpServer', x=139.50, y=66.00, z=306.50], EntityChicken['Chicken'/93, l='MpServer', x=141.50, y=67.00, z=304.50], EntityCow['Cow'/108, l='MpServer', x=169.83, y=63.00, z=221.79], EntityCow['Cow'/109, l='MpServer', x=173.50, y=63.00, z=228.50], EntityCow['Cow'/110, l='MpServer', x=177.50, y=63.00, z=226.50], EntityCow['Cow'/111, l='MpServer', x=179.50, y=63.00, z=225.50], EntityCow['Cow'/112, l='MpServer', x=191.53, y=64.00, z=195.15], EntityCow['Cow'/114, l='MpServer', x=195.50, y=64.00, z=186.50], EntityCow['Cow'/115, l='MpServer', x=195.30, y=64.00, z=191.75], EntityCow['Cow'/116, l='MpServer', x=192.50, y=63.00, z=223.50], EntityCow['Cow'/117, l='MpServer', x=191.50, y=64.00, z=221.50], EntityCow['Cow'/118, l='MpServer', x=191.50, y=64.00, z=221.50], EntityCow['Cow'/119, l='MpServer', x=192.50, y=66.00, z=217.50], EntityZombie['Zombie'/6264, l='MpServer', x=97.50, y=26.00, z=301.50], EntityZombie['Zombie'/6265, l='MpServer', x=91.74, y=27.00, z=309.49], EntityCreeper['Creeper'/6266, l='MpServer', x=96.50, y=26.00, z=299.50], EntitySpider['Spider'/4345, l='MpServer', x=158.57, y=20.00, z=313.52], EntitySkeleton['Skeleton'/6408, l='MpServer', x=90.50, y=28.00, z=309.50], EntitySkeleton['Skeleton'/6437, l='MpServer', x=96.50, y=35.00, z=208.50], EntitySkeleton['Skeleton'/6438, l='MpServer', x=96.50, y=35.00, z=209.50], EntitySkeleton['Skeleton'/6462, l='MpServer', x=183.50, y=33.00, z=225.50], EntityZombie['Zombie'/6472, l='MpServer', x=98.50, y=31.00, z=325.50], EntityZombie['Zombie'/6473, l='MpServer', x=98.50, y=31.00, z=322.50], EntityZombie['Zombie'/4432, l='MpServer', x=109.50, y=26.00, z=231.50], EntityCreeper['Creeper'/6485, l='MpServer', x=92.50, y=19.00, z=182.50], EntityPlayerSP['Kayanosenpai'/2394, l='MpServer', x=117.76, y=71.00, z=260.43], EntitySpider['Spider'/6537, l='MpServer', x=110.50, y=19.00, z=339.50], EntitySpider['Spider'/6538, l='MpServer', x=114.50, y=19.00, z=337.50], EntityBat['Bat'/6557, l='MpServer', x=81.62, y=45.04, z=237.45], EntitySkeleton['Skeleton'/6591, l='MpServer', x=54.50, y=15.00, z=184.50], EntityCreeper['Creeper'/6592, l='MpServer', x=59.34, y=15.00, z=183.74], EntityCreeper['Creeper'/6593, l='MpServer', x=189.50, y=32.00, z=208.50], EntityCreeper['Creeper'/6595, l='MpServer', x=177.50, y=39.00, z=232.50], EntityItem['item.tile.sapling.oak'/6600, l='MpServer', x=158.30, y=72.00, z=286.41], EntitySkeleton['Skeleton'/4591, l='MpServer', x=133.50, y=43.00, z=243.50], EntitySpider['Spider'/4615, l='MpServer', x=97.50, y=33.00, z=335.50], EntityItem['item.item.seeds'/4673, l='MpServer', x=162.36, y=67.00, z=313.65], EntitySkeleton['Skeleton'/4918, l='MpServer', x=112.50, y=28.00, z=233.50], EntityZombie['Zombie'/2885, l='MpServer', x=112.25, y=28.00, z=334.98], EntityAAGun['entity.AAGun.name'/4958, l='MpServer', x=114.50, y=74.00, z=254.50], EntityBat['Bat'/5068, l='MpServer', x=109.68, y=31.64, z=231.04], EntityCreeper['Creeper'/5100, l='MpServer', x=91.50, y=19.00, z=184.50], EntityBat['Bat'/5196, l='MpServer', x=108.43, y=41.10, z=247.70], EntitySpider['Spider'/5240, l='MpServer', x=117.48, y=29.00, z=292.54], EntityCreeper['Creeper'/5297, l='MpServer', x=111.50, y=44.00, z=217.50], EntityBat['Bat'/5310, l='MpServer', x=158.13, y=23.69, z=303.40], EntityAAGun['entity.AAGun.name'/5392, l='MpServer', x=117.50, y=74.00, z=252.50], EntityZombie['Zombie'/5419, l='MpServer', x=106.50, y=28.00, z=326.50], EntitySkeleton['Skeleton'/5420, l='MpServer', x=107.50, y=28.00, z=328.50], EntitySpider['Spider'/5466, l='MpServer', x=111.50, y=13.00, z=182.50], EntityBat['Bat'/5503, l='MpServer', x=86.75, y=46.86, z=236.75], EntityCreeper['Creeper'/3497, l='MpServer', x=85.50, y=15.00, z=184.50], EntityCreeper['Creeper'/3498, l='MpServer', x=84.50, y=15.00, z=184.50], EntityCreeper['Creeper'/5588, l='MpServer', x=55.50, y=15.00, z=184.50], EntityBat['Bat'/5716, l='MpServer', x=112.25, y=26.10, z=311.25], EntityCreeper['Creeper'/5735, l='MpServer', x=180.82, y=34.00, z=223.50], EntityZombie['Zombie'/5815, l='MpServer', x=125.82, y=63.00, z=182.50], EntityBat['Bat'/3797, l='MpServer', x=114.59, y=28.10, z=316.25], EntitySkeleton['Skeleton'/5905, l='MpServer', x=87.50, y=49.00, z=247.50], EntityBat['Bat'/5914, l='MpServer', x=111.47, y=28.98, z=336.24], EntityBat['Bat'/5915, l='MpServer', x=105.84, y=32.34, z=332.00], EntityItem['item.tile.doublePlant.rose'/5927, l='MpServer', x=86.13, y=63.00, z=234.70], EntityCreeper['Creeper'/5929, l='MpServer', x=83.50, y=33.00, z=308.50], EntitySkeleton['Skeleton'/5930, l='MpServer', x=78.52, y=33.00, z=313.22], EntityCreeper['Creeper'/5931, l='MpServer', x=80.50, y=33.00, z=310.50], EntityCreeper['Creeper'/3964, l='MpServer', x=78.70, y=24.24, z=221.30], EntitySkeleton['Skeleton'/6013, l='MpServer', x=165.50, y=22.00, z=314.50], EntityCreeper['Creeper'/6029, l='MpServer', x=114.50, y=39.00, z=207.50], EntityBat['Bat'/6075, l='MpServer', x=159.38, y=24.45, z=303.84], EntitySpider['Spider'/6113, l='MpServer', x=109.50, y=28.00, z=330.50], EntitySpider['Spider'/6115, l='MpServer', x=107.50, y=28.00, z=329.50], EntitySpider['Spider'/6116, l='MpServer', x=107.50, y=28.00, z=331.50], EntityEnderman['Enderman'/6117, l='MpServer', x=118.51, y=29.00, z=341.40], EntityBat['Bat'/6138, l='MpServer', x=113.08, y=14.49, z=247.70]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:420)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2748)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:426)
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:498)
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 7 (amd64) version 6.1
Java Version: 1.8.0_265, Eclipse OpenJ9
Java VM Version: Eclipse OpenJ9 VM (JRE 1.8.0 Windows 7 amd64-64-Bit Compressed References 20200728_776 (JIT enabled, AOT enabled)
OpenJ9 - 34cf4c075
OMR - 113e54219
JCL - c82ff0c20f based on jdk8u265-b01), Eclipse OpenJ9
Memory: 53360800 bytes (50 MB) / 514850816 bytes (491 MB) up to 4294967296 bytes (4096 MB)
JVM Flags: 11 total; -Xoptionsfile=C:\Program Files\AdoptOpenJDK\jdk-8.0.265.01-openj9\jre\bin\compressedrefs\options.default -Xlockword:mode=default,noLockword=java/lang/String,noLockword=java/util/MapEntry,noLockword=java/util/HashMap$Entry,noLockword=org/apache/harmony/luni/util/ModifiedMap$Entry,noLockword=java/util/Hashtable$Entry,noLockword=java/lang/invoke/MethodType,noLockword=java/lang/invoke/MethodHandle,noLockword=java/lang/invoke/CollectHandle,noLockword=java/lang/invoke/ConstructorHandle,noLockword=java/lang/invoke/ConvertHandle,noLockword=java/lang/invoke/ArgumentConversionHandle,noLockword=java/lang/invoke/AsTypeHandle,noLockword=java/lang/invoke/ExplicitCastHandle,noLockword=java/lang/invoke/FilterReturnHandle,noLockword=java/lang/invoke/DirectHandle,noLockword=java/lang/invoke/ReceiverBoundHandle,noLockword=java/lang/invoke/DynamicInvokerHandle,noLockword=java/lang/invoke/FieldHandle,noLockword=java/lang/invoke/FieldGetterHandle,noLockword=java/lang/invoke/FieldSetterHandle,noLockword=java/lang/invoke/StaticFieldGetterHandle,noLockword=java/lang/invoke/StaticFieldSetterHandle,noLockword=java/lang/invoke/IndirectHandle,noLockword=java/lang/invoke/InterfaceHandle,noLockword=java/lang/invoke/VirtualHandle,noLockword=java/lang/invoke/PrimitiveHandle,noLockword=java/lang/invoke/InvokeExactHandle,noLockword=java/lang/invoke/InvokeGenericHandle,noLockword=java/lang/invoke/VarargsCollectorHandle,noLockword=java/lang/invoke/ThunkTuple -Xjcl:jclse29 -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G -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 14.23.2.2624 7 mods loaded, 7 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-1.12.2-14.23.2.2624.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UCHIJAAAA | forge              | 14.23.2.2624 | forge-1.12.2-14.23.2.2624.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UCHIJAAAA | mercurius_updater  | 1.0          | MercuriusUpdater-1.12.2.jar   | None                                     |
| UCHIJAAAA | flansmod           | 5.5.2        | Flan's Mod-1.12.2-5.5.2.jar   | None                                     |
| UCHIJAAAA | flansmodapocalypse | 1.0          | Flan's Mod-1.12.2-5.5.2.jar   | None                                     |

Loaded coremods (and transformers): 
GL info: ' Vendor: 'Intel' Version: '4.3.0 - Build 10.18.14.4414' Renderer: 'Intel(R) HD Graphics 4600'
Launched Version: 1.12.2-forge1.12.2-14.23.2.2624
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 4600 GL version 4.3.0 - Build 10.18.14.4414, 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: Kayano mix
Current Language: English (United Kingdom)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Core(TM) i5-4210M CPU @ 2.60GHz

[Kayanchi]

And sometimes I get a crash if I scroll too quickly through a hotbar full of wepons