I Had a external storage on a sophisticated barrel with about 15k copper in one of the slots. I traded out the external storage with a importer because I had enough storage to put it all in, but the moment I placed the importer my game froze, it kicked my friend and my game didn't come back. Now every time I try and load the world it tells me "Invalid player data".

Extra mods I added:
ESSENTIAL Mod (for easy hosting of my world)
Cyclic
Overloaded Armor bar
Armor Toughness Bar
Pedestals

But I don't think any of these mods could have caused this issue, I could be wrong though.

Crash Report:
---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 2023-08-10 21:44:05
Description: Exception ticking world

java.lang.ClassCastException: class com.refinedmods.refinedstorage.apiimpl.network.node.ExporterNetworkNode cannot be cast to class com.refinedmods.refinedstorage.apiimpl.network.node.ImporterNetworkNode (com.refinedmods.refinedstorage.apiimpl.network.node.ExporterNetworkNode and com.refinedmods.refinedstorage.apiimpl.network.node.ImporterNetworkNode are in module [email protected] of loader 'TRANSFORMER' @5cba890e)
at com.refinedmods.refinedstorage.blockentity.ImporterBlockEntity.writeUpdate(ImporterBlockEntity.java:56) ~[refinedstorage-1.11.6.jar%23794!/:1.11.6] {re:classloading}
at com.refinedmods.refinedstorage.blockentity.BaseBlockEntity.m_5995_(BaseBlockEntity.java:35) ~[refinedstorage-1.11.6.jar%23794!/:1.11.6] {re:classloading}
at net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket.m_195642_(ClientboundBlockEntityDataPacket.java:21) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
at com.refinedmods.refinedstorage.blockentity.BaseBlockEntity.getUpdatePacket(BaseBlockEntity.java:40) ~[refinedstorage-1.11.6.jar%23794!/:1.11.6] {re:classloading}
at com.refinedmods.refinedstorage.blockentity.BaseBlockEntity.m_58483_(BaseBlockEntity.java:13) ~[refinedstorage-1.11.6.jar%23794!/:1.11.6] {re:classloading}
at net.minecraft.server.level.ChunkHolder.m_140029_(ChunkHolder.java:244) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
at net.minecraft.server.level.ChunkHolder.m_140032_(ChunkHolder.java:236) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
at net.minecraft.server.level.ChunkHolder.m_140054_(ChunkHolder.java:216) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
at net.minecraft.server.level.ServerChunkCache.m_184021_(ServerChunkCache.java:372) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:bugfix.chunk_deadlock.ServerChunkCacheMixin,pl:mixin:A}
at java.util.ArrayList.forEach(ArrayList.java:1511) ~[?:?] {re:mixin}
at net.minecraft.server.level.ServerChunkCache.m_8490_(ServerChunkCache.java:371) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:bugfix.chunk_deadlock.ServerChunkCacheMixin,pl:mixin:A}
at net.minecraft.server.level.ServerChunkCache.m_201698_(ServerChunkCache.java:310) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:bugfix.chunk_deadlock.ServerChunkCacheMixin,pl:mixin:A}
at net.minecraft.server.level.ServerLevel.m_8793_(ServerLevel.java:285) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,xf:fml:sandbox:chunk_level_init,re:classloading,pl:accesstransformer:B,xf:fml:sandbox:chunk_level_init,pl:mixin:APP:kubejs-common.mixins.json:ServerLevelMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.cache_strongholds.ServerLevelMixin,pl:mixin:APP:supplementaries-common.mixins.json:ServerLevelMixin,pl:mixin:APP:botania_xplat.mixins.json:ServerLevelMixin,pl:mixin:APP:corgilib.mixins.json:MixinServerLevel,pl:mixin:APP:ad_astra-common.mixins.json:ServerLevelMixin,pl:mixin:APP:observable.common.json:ServerLevelMixin,pl:mixin:APP:ars_elemental.mixins.json:ServerLevelMixin,pl:mixin:APP:starlight.mixins.json:common.world.ServerWorldMixin,pl:mixin:APP:immersiveengineering.mixins.json:coremods.ServerWorldMixin,pl:mixin:APP:byg.mixins.json:common.world.MixinServerLevel,pl:mixin:APP:betterdeserttemples.mixins.json:ServerLevelMixin,pl:mixin:APP:create.mixins.json:accessor.ServerLevelAccessor,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:866) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:ae2.mixins.json:spatial.MinecraftServerMixin,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:access.MinecraftServerAccess,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:mixins.essential.json:feature.sps.Mixin_IntegratedServerResourcePack,pl:mixin:APP:mixins.essential.json:server.MinecraftServerMixin_PvPGameRule,pl:mixin:APP:mixins.essential.json:server.Mixin_PublishServerStatusResponse,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:806) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:ae2.mixins.json:spatial.MinecraftServerMixin,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:access.MinecraftServerAccess,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:mixins.essential.json:feature.sps.Mixin_IntegratedServerResourcePack,pl:mixin:APP:mixins.essential.json:server.MinecraftServerMixin_PvPGameRule,pl:mixin:APP:mixins.essential.json:server.Mixin_PublishServerStatusResponse,pl:mixin:A}
at net.minecraft.client.server.IntegratedServer.m_5705_(IntegratedServer.java:84) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:modernfix-common.mixins.json:perf.thread_priorities.IntegratedServerMixin,pl:mixin:APP:mixins.essential.json:server.integrated.MixinIntegratedServer,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:654) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:ae2.mixins.json:spatial.MinecraftServerMixin,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:access.MinecraftServerAccess,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:mixins.essential.json:feature.sps.Mixin_IntegratedServerResourcePack,pl:mixin:APP:mixins.essential.json:server.MinecraftServerMixin_PvPGameRule,pl:mixin:APP:mixins.essential.json:server.Mixin_PublishServerStatusResponse,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:244) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:ae2.mixins.json:spatial.MinecraftServerMixin,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:access.MinecraftServerAccess,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:mixins.essential.json:feature.sps.Mixin_IntegratedServerResourcePack,pl:mixin:APP:mixins.essential.json:server.MinecraftServerMixin_PvPGameRule,pl:mixin:APP:mixins.essential.json:server.Mixin_PublishServerStatusResponse,pl:mixin:A}
at java.lang.Thread.run(Thread.java:833) [?:?] {re:mixin}

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Server thread
Stacktrace:
at com.refinedmods.refinedstorage.blockentity.ImporterBlockEntity.writeUpdate(ImporterBlockEntity.java:56) ~[refinedstorage-1.11.6.jar%23794!/:1.11.6] {re:classloading}
at com.refinedmods.refinedstorage.blockentity.BaseBlockEntity.m_5995_(BaseBlockEntity.java:35) ~[refinedstorage-1.11.6.jar%23794!/:1.11.6] {re:classloading}
at net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket.m_195642_(ClientboundBlockEntityDataPacket.java:21) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
at com.refinedmods.refinedstorage.blockentity.BaseBlockEntity.getUpdatePacket(BaseBlockEntity.java:40) ~[refinedstorage-1.11.6.jar%23794!/:1.11.6] {re:classloading}
at com.refinedmods.refinedstorage.blockentity.BaseBlockEntity.m_58483_(BaseBlockEntity.java:13) ~[refinedstorage-1.11.6.jar%23794!/:1.11.6] {re:classloading}
at net.minecraft.server.level.ChunkHolder.m_140029_(ChunkHolder.java:244) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
at net.minecraft.server.level.ChunkHolder.m_140032_(ChunkHolder.java:236) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
at net.minecraft.server.level.ChunkHolder.m_140054_(ChunkHolder.java:216) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
at net.minecraft.server.level.ServerChunkCache.m_184021_(ServerChunkCache.java:372) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:bugfix.chunk_deadlock.ServerChunkCacheMixin,pl:mixin:A}
at java.util.ArrayList.forEach(ArrayList.java:1511) ~[?:?] {re:mixin}
at net.minecraft.server.level.ServerChunkCache.m_8490_(ServerChunkCache.java:371) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:bugfix.chunk_deadlock.ServerChunkCacheMixin,pl:mixin:A}
at net.minecraft.server.level.ServerChunkCache.m_201698_(ServerChunkCache.java:310) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:bugfix.chunk_deadlock.ServerChunkCacheMixin,pl:mixin:A}
at net.minecraft.server.level.ServerLevel.m_8793_(ServerLevel.java:285) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,xf:fml:sandbox:chunk_level_init,re:classloading,pl:accesstransformer:B,xf:fml:sandbox:chunk_level_init,pl:mixin:APP:kubejs-common.mixins.json:ServerLevelMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.cache_strongholds.ServerLevelMixin,pl:mixin:APP:supplementaries-common.mixins.json:ServerLevelMixin,pl:mixin:APP:botania_xplat.mixins.json:ServerLevelMixin,pl:mixin:APP:corgilib.mixins.json:MixinServerLevel,pl:mixin:APP:ad_astra-common.mixins.json:ServerLevelMixin,pl:mixin:APP:observable.common.json:ServerLevelMixin,pl:mixin:APP:ars_elemental.mixins.json:ServerLevelMixin,pl:mixin:APP:starlight.mixins.json:common.world.ServerWorldMixin,pl:mixin:APP:immersiveengineering.mixins.json:coremods.ServerWorldMixin,pl:mixin:APP:byg.mixins.json:common.world.MixinServerLevel,pl:mixin:APP:betterdeserttemples.mixins.json:ServerLevelMixin,pl:mixin:APP:create.mixins.json:accessor.ServerLevelAccessor,pl:mixin:A}
-- Affected level --
Details:
All players: 2 total; [ServerPlayer['bloxer123link'/3363, l='ServerLevel[Amazing]', x=-7.97, y=63.00, z=60.07], ServerPlayer['Pruxdence'/1357, l='ServerLevel[Amazing]', x=-8.51, y=63.00, z=63.53]]
Chunk stats: 2389
Level dimension: minecraft:overworld
Level spawn location: World: (64,63,48), Section: (at 0,15,0 in 4,3,3; chunk contains blocks 64,-64,48 to 79,319,63), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,-64,0 to 511,319,511)
Level time: 2928770 game time, 2439206 day time
Level name: Amazing
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Level weather: Rain time: 86544 (now: false), thunder time: 15920 (now: false)
Known server brands: forge
Level was modded: true
Level storage version: 0x04ABD - Anvil
Stacktrace:
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:866) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:ae2.mixins.json:spatial.MinecraftServerMixin,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:access.MinecraftServerAccess,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:mixins.essential.json:feature.sps.Mixin_IntegratedServerResourcePack,pl:mixin:APP:mixins.essential.json:server.MinecraftServerMixin_PvPGameRule,pl:mixin:APP:mixins.essential.json:server.Mixin_PublishServerStatusResponse,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:806) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:ae2.mixins.json:spatial.MinecraftServerMixin,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:access.MinecraftServerAccess,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:mixins.essential.json:feature.sps.Mixin_IntegratedServerResourcePack,pl:mixin:APP:mixins.essential.json:server.MinecraftServerMixin_PvPGameRule,pl:mixin:APP:mixins.essential.json:server.Mixin_PublishServerStatusResponse,pl:mixin:A}
at net.minecraft.client.server.IntegratedServer.m_5705_(IntegratedServer.java:84) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:modernfix-common.mixins.json:perf.thread_priorities.IntegratedServerMixin,pl:mixin:APP:mixins.essential.json:server.integrated.MixinIntegratedServer,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:654) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:ae2.mixins.json:spatial.MinecraftServerMixin,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:access.MinecraftServerAccess,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:mixins.essential.json:feature.sps.Mixin_IntegratedServerResourcePack,pl:mixin:APP:mixins.essential.json:server.MinecraftServerMixin_PvPGameRule,pl:mixin:APP:mixins.essential.json:server.Mixin_PublishServerStatusResponse,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:244) ~[client-1.19.2-20220805.130853-srg.jar%23891!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:ae2.mixins.json:spatial.MinecraftServerMixin,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:access.MinecraftServerAccess,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:mixins.essential.json:feature.sps.Mixin_IntegratedServerResourcePack,pl:mixin:APP:mixins.essential.json:server.MinecraftServerMixin_PvPGameRule,pl:mixin:APP:mixins.essential.json:server.Mixin_PublishServerStatusResponse,pl:mixin:A}
at java.lang.Thread.run(Thread.java:833) [?:?] {re:mixin}