so i tried to load up the modpack,i also added some of my own mods(only two i added was tough as nails and dynamic surroundings) but i got this crash report, what do i do?

---- Minecraft Crash Report ----

WARNING: coremods are present:
TransformLoader (DynamicSurroundings-1.12.2-3.6.1.0.jar)
Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
regeneration (Regeneration-1.12.2-1.4.0.jar)
Contact their authors BEFORE contacting forge

// Hey, that tickles! Hehehe!

Time: 7/11/21 4:48 PM
Description: Initializing game

java.lang.NoSuchMethodError: net.minecraftforge.fml.relauncher.FMLLaunchHandler.isDeobfuscatedEnvironment()Z
at net.minecraft.util.SoundCategory.findField(SourceFile:574)
at net.minecraft.util.SoundCategory.(SourceFile:39)
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 java.lang.Class.getEnumConstantsShared(Class.java:3320)
at java.lang.System$2.getEnumConstantsShared(System.java:1249)
at java.util.EnumMap.getKeyUniverse(EnumMap.java:752)
at java.util.EnumMap.(EnumMap.java:138)
at com.google.common.collect.Maps.newEnumMap(Maps.java:481)
at net.minecraft.client.settings.GameSettings.(GameSettings.java:144)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:443)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:377)
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 thread
Stacktrace:
at net.minecraft.util.SoundCategory.findField(SourceFile:574)
at net.minecraft.util.SoundCategory.(SourceFile:39)
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 java.lang.Class.getEnumConstantsShared(Class.java:3320)
at java.lang.System$2.getEnumConstantsShared(System.java:1249)
at java.util.EnumMap.getKeyUniverse(EnumMap.java:752)
at java.util.EnumMap.(EnumMap.java:138)
at com.google.common.collect.Maps.newEnumMap(Maps.java:481)
at net.minecraft.client.settings.GameSettings.(GameSettings.java:144)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:443)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:377)
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: 454573040 bytes (433 MB) / 715653120 bytes (682 MB) up to 6084886528 bytes (5803 MB)
JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx6528m -Xms256m -XX:PermSize=256m
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML:
Loaded coremods (and transformers):
TransformLoader (DynamicSurroundings-1.12.2-3.6.1.0.jar)

Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
invtweaks.forge.asm.ContainerTransformer
regeneration (Regeneration-1.12.2-1.4.0.jar)
me.fril.regeneration.client.sound.echo.RegenClassTransformer
Launched Version: forge-14.23.5.2772
LWJGL: 2.9.4
OpenGL: ERROR RuntimeException: No OpenGL context found in the current thread.
GL Caps:
Using VBOs: ERROR NullPointerException: null
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: ERROR NullPointerException: null
Current Language: ERROR NullPointerException: null
Profiler Position: N/A (disabled)
CPU:
OptiFine Version: OptiFine_1.12.2_HD_U_G5
OptiFine Build: 20210124-142939
Shaders: null
OpenGlVersion: null
OpenGlRenderer: null
OpenGlVendor: null
CpuCount: 0

this mod is also apart of doctor who modpack, and it crashed on load up too

Hey There,
Where did you download Regeneration from? You are using such an outdated version of it
The latest (and last) version of it for 1.12.2 is 3.0.2 while you are on version 1.4.0

Ive never used this website so idk how to reply directly,but i got it from the base modpack from this: https://www.curseforge.com/minecraft/modpacks/dwmodpack

im seeing if i load it up without adding mods will fix the issue at the moment

so yeah It now worked, I think me adding mods from the modpack messed it up

Well, if you want a download link to the latest version of Regeneration for 1.12 that works, here you go
https://www.curseforge.com/minecraft/mc-mods/regeneration/download/2994995