Hello ! (I'm french) 
When i start the server, i have a error message. I want to use all these mods :
AdFinders-1.12.2-2.3.17.0-build.0559.jar
AmbientSounds_v3.0.18_mc1.12.2.jar
BiblioCraft[v2.4.5][MC1.12.2].jar
BiomesOPlenty-1.12.2-7.0.1.2444-universal.jar
Chameleon-1.12-4.1.3.jar
champions-1.12.2-1.0.11.9.jar
corpse-1.12.2-1.0.8.jar
CreativeCore_v1.10.34_mc1.12.2.jar
FallingTree-1.12.2-2.4.0.jar
ForgeEndertech-1.12.2-4.5.5.0-build.0561.jar
iChunUtil-1.12.2-7.2.2.jar
ironchest-1.12.2-7.0.72.847.jar
IvToolkit-1.3.3-1.12.jar
jei_1.12.2-4.16.1.302.jar
mcw-roofs-1.0.2-mc1.12.2.jar
Morpheus-1.12.2-3.5.106.jar
MutantBeasts-1.12.2-1.0.1.jar
placeableitems-3.3.jar
RecurrentComplex-1.4.8.2.jar
StorageDrawers-1.12.2-5.4.2.jar
Sync-1.12.2-7.1.0.jar
And now the Crash Report
---- Minecraft Crash Report ----
WARNING: coremods are present:
CreativePatchingLoader (CreativeCore_v1.10.34_mc1.12.2.jar)
CorePlugin (ForgeEndertech-1.12.2-4.5.5.0-build.0561.jar)
IvToolkit (IvToolkit-1.3.3-1.12.jar)
Contact their authors BEFORE contacting forge
// Daisy, daisy...
Time: 12/18/20 5:39 PM
Description: Exception in server tick loop
net.minecraftforge.fml.common.MultipleModsErrored
at net.minecraftforge.fml.common.Loader.sortModList(Loader.java:300)
at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:547)
at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:97)
at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:335)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:122)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:483)
at java.lang.Thread.run(Thread.java:748)
A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
Minecraft Version: 1.12
Operating System: Linux (amd64) version 5.4.0-52-generic
Java Version: 1.8.0_272, Oracle Corporation
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 744748584 bytes (710 MB) / 993001472 bytes (947 MB) up to 1398276096 bytes (1333 MB)
JVM Flags: 3 total; -XX:MaxMetaspaceSize=200M -Xmx1500M -Xms750M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.40 Powered by Forge 14.21.1.2387 25 mods loaded, 25 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
U minecraft{1.12} [Minecraft] (minecraft.jar)
U mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
U FML{8.0.99.99} [Forge Mod Loader] (forge.jar)
U forge{14.21.1.2387} [Minecraft Forge] (forge.jar)
U creativecoredummy{1.0.0} [CreativeCoreDummy] (minecraft.jar)
U ivtoolkit{1.3.3-1.12} [IvToolkit] (minecraft.jar)
U adfinders{1.12.2-2.3.17.0} [Advanced Finders] (AdFinders-1.12.2-2.3.17.0-build.0559.jar)
U bibliocraft{2.4.5} [BiblioCraft] (BiblioCraft[v2.4.5][MC1.12.2].jar)
U biomesoplenty{7.0.1.2444} [Biomes O' Plenty] (BiomesOPlenty-1.12.2-7.0.1.2444-universal.jar)
U chameleon{1.12-4.1.3} [Chameleon] (Chameleon-1.12-4.1.3.jar)
U champions{1.12.2-1.0.11.9} [Champions] (champions-1.12.2-1.0.11.9.jar)
U corpse{1.12.2-1.0.8} [Corpse] (corpse-1.12.2-1.0.8.jar)
U creativecore{1.10.0} [CreativeCore] (CreativeCore_v1.10.34_mc1.12.2.jar)
U falling_tree{2.4.0} [Falling Tree] (FallingTree-1.12.2-2.4.0.jar)
U forgeendertech{1.12.2-4.5.5.0} [Forge Endertech] (ForgeEndertech-1.12.2-4.5.5.0-build.0561.jar)
U ichunutil{7.2.2} [iChunUtil] (iChunUtil-1.12.2-7.2.2.jar)
U ironchest{1.12.2-7.0.67.844} [Iron Chest] (ironchest-1.12.2-7.0.72.847.jar)
U jei{4.16.1.302} [Just Enough Items] (jei_1.12.2-4.16.1.302.jar)
U mcwroofs{1.0.2} [Macaw's Roofs] (mcw-roofs-1.0.2-mc1.12.2.jar)
U morpheus{1.12.2-3.5.106} [Morpheus] (Morpheus-1.12.2-3.5.106.jar)
U mutantbeasts{1.12.2-1.0.1} [Mutant Beasts] (MutantBeasts-1.12.2-1.0.1.jar)
U placeableitems{3.3} [Placeable Items Mod] (placeableitems-3.3.jar)
U reccomplex{1.4.8.2} [Recurrent Complex] (RecurrentComplex-1.4.8.2.jar)
U storagedrawers{5.2.2} [Storage Drawers] (StorageDrawers-1.12.2-5.4.2.jar)
U sync{7.1.0} [Sync] (Sync-1.12.2-7.1.0.jar)
Loaded coremods (and transformers):
CreativePatchingLoader (CreativeCore_v1.10.34_mc1.12.2.jar)
CorePlugin (ForgeEndertech-1.12.2-4.5.5.0-build.0561.jar)
IvToolkit (IvToolkit-1.3.3-1.12.jar)
Profiler Position: N/A (disabled)
Is Modded: Definitely; Server brand changed to 'fml,forge'
Type: Dedicated Server (map_server.txt)
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When i play in solo, all mods works normally, but not when i start the server.
I tried to change many time the version of forge but i have the same result.
Please help me !
Sorry for my poor english 
