Hi, I have found a conflict with your mod as seen here:

http://www.minecraftforge.net/forum/topic/65658-1122-updating-modpack/

Seems to be that MicDoodleCore is conflicting with your mod.

This is an issue of ItemPhysic and not CreativeCore. I fixed it and the new version should be available soon: https://minecraft.curseforge.com/projects/itemphysic/files/2596622

Still getting the same error after updating item physic.

Here is the error:

[17:21:23] [main/INFO] [STDOUT]: [team.chisel.ctm.client.asm.CTMTransformer:preTransform:229]: Transforming Class [net.minecraft.block.Block], Method [getExtendedState]
[17:21:23] [main/INFO] [STDOUT]: [team.chisel.ctm.client.asm.CTMTransformer:finishTransform:241]: Transforming net.minecraft.block.Block Finished.
[17:21:24] [main/INFO] [STDOUT]: [com.creativemd.creativecore.transformer.CreativeTransformer:transform:52]: [itemphysic] Patched net.minecraft.entity.item.EntityItem ...
[17:21:24] [main/INFO] [STDOUT]: [com.creativemd.creativecore.transformer.CreativeTransformer:transform:52]: [itemphysic] Patched net.minecraft.entity.item.EntityItem ...
[17:21:24] [main/INFO] [STDOUT]: [com.creativemd.creativecore.transformer.CreativeTransformer:transform:52]: [itemphysic] Patched net.minecraft.entity.item.EntityItem ...
[17:21:25] [main/INFO] [STDOUT]: [com.creativemd.creativecore.transformer.CreativeTransformer:transform:52]: [itemphysic] Patched net.minecraft.entity.item.EntityItem ...
[17:21:25] [main/INFO] [STDERR]: [micdoodle8.mods.miccore.MicdoodleTransformer:printResultsAndReset:1700]: Potential problem: Galacticraft did not complete injection of bytecode into: acl (0 / 1)
[17:21:25] [main/ERROR] [LaunchWrapper]: Unable to launch
java.lang.reflect.InvocationTargetException: null
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51]
at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/entity/item/EntityItem
at net.minecraft.init.Bootstrap.func_151354_b(Bootstrap.java:498) ~[ni.class:?]
at net.minecraft.client.Minecraft.(Minecraft.java:364) ~[bib.class:?]
at net.minecraft.client.main.Main.main(SourceFile:123) ~[Main.class:?]
... 6 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.entity.item.EntityItem
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
at net.minecraft.init.Bootstrap.func_151354_b(Bootstrap.java:498) ~[ni.class:?]
at net.minecraft.client.Minecraft.(Minecraft.java:364) ~[bib.class:?]
at net.minecraft.client.main.Main.main(SourceFile:123) ~[Main.class:?]
... 6 more
Caused by: java.lang.ClassFormatError: Duplicate method name&signature in class file net/minecraft/entity/item/EntityItem
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_51]
at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_51]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_51]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
at net.minecraft.init.Bootstrap.func_151354_b(Bootstrap.java:498) ~[ni.class:?]
at net.minecraft.client.Minecraft.(Minecraft.java:364) ~[bib.class:?]
at net.minecraft.client.main.Main.main(SourceFile:123) ~[Main.class:?]
... 6 more
[17:21:25] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException
[17:21:25] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49)
[17:21:25] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.SecurityManager.checkExit(SecurityManager.java:761)
[17:21:25] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Runtime.exit(Runtime.java:107)
[17:21:25] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.System.exit(System.java:971)
[17:21:25] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
[17:21:25] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

Was the one you just uploaded the new version?

Looks like you forgot to remove the old version.

hey this is a problem ---- Minecraft Crash Report ----

WARNING: coremods are present:
CreativePatchingLoader (CreativeCore-1.12.2.jar)
ItemPatchingLoader (ItemPhysic_Full_1.4.34_mc1.12.2.jar)
LittlePatchingLoader (LittleTiles-Mod-1.12.2.jar)
Contact their authors BEFORE contacting forge

// I let you down. Sorry :(

Time: 3/27/21 4:18 PM
Description: Initializing game

java.lang.NoClassDefFoundError: com/creativemd/creativecore/core/CreativeCoreClient
at com.creativemd.littletiles.client.LittleTilesClient.loadSide(LittleTilesClient.java:252)
at com.creativemd.littletiles.LittleTiles.registerItems(LittleTiles.java:265)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_5_LittleTiles_registerItems_Register.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus$1.invoke(EventBus.java:144)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:850)
at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:630)
at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:252)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:467)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:378)
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)
Caused by: java.lang.ClassNotFoundException: com.creativemd.creativecore.core.CreativeCoreClient
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)
... 18 more
Caused by: java.lang.NullPointerException

how do i fix it