Me and my friend wanted to make a custom mod pack hosted on aternos. I downloaded the same mods as the server then started the server and my minecraft and I joined the server without issues. Then I sent the mods to my friend compressed in a zip folder (i don’t know if that has anything to do with the issue). He unpacked it put it in his mod folder and started it but couldn't join the server and got this issue:

 

internal exception: java.lang.runtimeexception: server not initialized yet! call IMDLib.entityHandler (modid)

 

Also we are using curseforge launcher to manage the mods on client side. But as I said it works on my side but not with my friend, that’s why it doesn’t make sense

 

Mod list:

 

xplosives-1.2.0.jar

whisperwoods-1.18.2-2.1.0-forge.jar

waystones-forge-1.18.2-10.2.2.jar

voicechat-forge-1.18.2-2.4.32.jar

trashslot-forge-1.18.2-11.0.3.jar

towns_and_towers_forge-1.10.0.1+1.18.2.jar

torchmaster-18.2.1.jar

ToolBelt-1.18.2-1.18.9.jar

toms_storage-1.18.2-1.4.4.jar

swingthroughgrass-1.18.2-1.9.1.jar

strictly_origins_v5.1_1.18.2.jar

starlight-1.0.2+forge.546ae87.jar

SpartanWeaponry-1.18.2-3.0.4.jar

SimpleQuarry-1.18.2-18.2.5.jar

simpleplanes-1.18.2-5.2.2.jar

secretrooms-1.18.2-1.1.5.jar

right-click-harvest-3.2.0+1.18.2-forge.jar

REIPluginCompatibilities-forge-8.0.89.jar

RoughlyEnough|tems-8.3.681-forge.jar

RegionsUnexploredForge-0.4.1_1+1.18.2.jar

TerraBlender-forge-1.18.2-1.2.0.126.jar

Recall_Potion_v1.0.3-1.18.2.jar

Quark-3.2-358.jar

PickleTweaks-1.18.2-6.1.2.jar

Pehkui-3.7.11+1.18.2-forge.jar

Origins-1.18.2-1.4.1.4-unified.jar

naturalist-forge-1.1.1-1.18.2.jar

mysticaloaktree-1.18.2-1.2.jar

selene-1.18.2-1.17.14.jar

MysticalAgradditions-1.18.2-5.1.4.jar

MysticalAgriculture-1.18.2-5.1.5.jar

MultiMine-1.18.7.jar

moyai-1.18.2-1.1.4.jar

ModernDynamicSurroundings-5.0.0.4.jar

lootbeams-1.18.1-release-july1722.jar

journeymap-1.18.2-5.9.7-forge.jar

ironfurnaces-1.18.2-3.3.3.jar

ironchest-1.18.2-13.2.11.jar

industrial-foregoing-1.18.2-3.3.1.6-10.jar

titanium-1.18.2-3.5.11-45.jar

immersive_armors-1.5.6+1.18.2-forge.jar

hardcorerevival-forge-1.18.2-8.0.1.jar

HammerLib-1.18.2-18.2.16. jar

gravestone-1.18.2-1.0.1.jar

geckolib-forge-1.18-3.0.57.jar

findme-3.0.6-forge.jar

faithfulbackrooms3.0.0.7.jar

elevatorid-1.18.2-1.8.4.jar

EasyMagic-v3.3.0-1.18.2-Forge.jar

PuzzlesLib-v3.5.9-1.18.2-Forge.jar

easy_villagers-1.18.2-1.0.11.jar

easy_mob_farm_1.18.2-7.1.0.jar

DynamicTrees-1.18.2-1.0.4.jar

dragonseeker-1.1.1-1.18.2.jar

iceandfire-2.1.12-1.18.2.jar

Cucumber-1.18.2-5.1.5 jar

cloth-config-6.5.116-forge.jar

citadel-1.11.3-1.18.2.jar

chunkloaders-1.2.8a-forge-mc1.18.jar

supermartijn642configlib-1.1.8-forge-mc1.18.jar

supermartijn642corelib-1.1.17-forge-mc1.18.jar

cave_dweller-1.18.2-1.6.4.jar

carryon-1.18.2-1.17.1.12.jar

caelus-forge-1.18.1-3.0.0.2.jar

BotanyTrees-Forge-1.18.2-4.0.13.jar

BotanyPots-Forge-1.18.2-8.1.29.jar

Bookshelf-Forge-1.18.2-13.3.56.jar

balm-3.2.6.jar

AutoRegLib-1.7-53.jar

ars_nouveau-1.18.2-2.9.0.jar

curios-forge-1.18.2-5.0.9.2.jar

Patchouli-1.18.2-71.1.jar

architectury-4.12.94-forge.jar

almostunified-forge-1.18.2-0.3.10.jar

[1.18.2] SecurityCraft v1.9.8.jar

We need the crash report or debug.log, as explained in the FAQ