---- Minecraft Crash Report ----
// Shall we play a game?

Time: 4/30/20 3:41 PM
Description: Exception in server tick loop

java.lang.NoSuchMethodError: net.minecraft.network.PacketBuffer.func_218666_n()Ljava/lang/String;
at com.supermartijn642.packedup.PacketRename.decode(PacketRename.java:30) ~[?:1.0.10-mc1.15] {re:classloading}
at net.minecraftforge.fml.network.simple.IndexedMessageCodec.lambda$tryDecode$0(IndexedMessageCodec.java:120) ~[?:?] {re:classloading}
at java.util.Optional.map(Optional.java:215) ~[?:1.8.0_232] {}
at net.minecraftforge.fml.network.simple.IndexedMessageCodec.tryDecode(IndexedMessageCodec.java:120) ~[?:?] {re:classloading}
at net.minecraftforge.fml.network.simple.IndexedMessageCodec.consume(IndexedMessageCodec.java:162) ~[?:?] {re:classloading}
at net.minecraftforge.fml.network.simple.SimpleChannel.networkEventListener(SimpleChannel.java:80) ~[?:?] {re:classloading}
at net.minecraftforge.eventbus.EventBus.doCastFilter(EventBus.java:212) ~[eventbus-2.1.0-service.jar:?] {}
at net.minecraftforge.eventbus.EventBus.lambda$addListener$11(EventBus.java:204) ~[eventbus-2.1.0-service.jar:?] {}
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258) ~[eventbus-2.1.0-service.jar:?] {}
at net.minecraftforge.fml.network.NetworkInstance.dispatch(NetworkInstance.java:84) ~[?:?] {re:classloading}
at net.minecraftforge.fml.network.NetworkHooks.lambda$onCustomPayload$1(NetworkHooks.java:78) ~[?:?] {re:classloading}
at java.util.Optional.map(Optional.java:215) ~[?:1.8.0_232] {}
at net.minecraftforge.fml.network.NetworkHooks.onCustomPayload(NetworkHooks.java:78) ~[?:?] {re:classloading}
at net.minecraft.network.play.ServerPlayNetHandler.func_147349_a(ServerPlayNetHandler.java:1279) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.network.play.client.CCustomPayloadPacket.func_148833_a(CCustomPayloadPacket.java:42) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.network.play.client.CCustomPayloadPacket.func_148833_a(CCustomPayloadPacket.java:12) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.network.PacketThreadUtil.func_225383_a(SourceFile:21) ~[?:?] {re:classloading}
at net.minecraft.util.concurrent.TickDelayedTask.run(SourceFile:18) ~[?:?] {re:classloading}
at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(SourceFile:144) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) ~[?:?] {re:classloading}
at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:731) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:141) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(SourceFile:118) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.MinecraftServer.func_213205_aW(MinecraftServer.java:714) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_213168_p(MinecraftServer.java:708) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213161_c(SourceFile:127) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.MinecraftServer.func_213202_o(MinecraftServer.java:694) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:641) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_232] {}

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

-- System Details --
Details:
Minecraft Version: 1.15.2
Minecraft Version ID: 1.15.2
Operating System: FreeBSD (amd64) version 11.2-STABLE
Java Version: 1.8.0_232, Oracle Corporation
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1561271192 bytes (1488 MB) / 3028287488 bytes (2888 MB) up to 7635730432 bytes (7282 MB)
CPUs: 24
JVM Flags: 2 total; -Xmx8192M -Xms2048M
ModLauncher: 5.1.0+69+master.79f13f7
ModLauncher launch target: fmlserver
ModLauncher naming: srg
ModLauncher services:
/eventbus-2.1.0-service.jar eventbus PLUGINSERVICE
/forge-1.15.2-31.1.63.jar object_holder_definalize PLUGINSERVICE
/forge-1.15.2-31.1.63.jar runtime_enum_extender PLUGINSERVICE
/accesstransformers-2.1.1-shadowed.jar accesstransformer PLUGINSERVICE
/forge-1.15.2-31.1.63.jar capability_inject_definalize PLUGINSERVICE
/forge-1.15.2-31.1.63.jar runtimedistcleaner PLUGINSERVICE
/forge-1.15.2-31.1.63.jar fml TRANSFORMATIONSERVICE
/MixinBootstrap-1.0.3.jar mixinbootstrap TRANSFORMATIONSERVICE
/MixinBootstrap-1.0.3.jar mixin PLUGINSERVICE
/MixinBootstrap-1.0.3.jar mixinbootstrap PLUGINSERVICE
FML: 31.1
Forge: net.minecraftforge:31.1.63
FML Language Providers:
[email protected]
minecraft@1
Mod List:
damage_indicator-0.1.0.jar Ama's Damage Indicator {[email protected] DONE}
mining-helmet-1.15.2-1.0.8.jar Mining Helmet {[email protected] DONE}
berry_good-2.0.0.jar Berry Good {[email protected] DONE}
AdvancedSkinCustomization-2.8.2.jar Advanced Skin Customization {[email protected] DONE}
extratrades-1.1.jar Extra Trades {[email protected] DONE}
bambooblocks-1.15.2-1.3.jar Bamboo Blocks {[email protected] DONE}
jei-1.15.2-6.0.0.4.jar Just Enough Items {[email protected] DONE}
prefab-1.5.0.5.jar Prefab {[email protected] DONE}
buzzierbees-1.4.jar Buzzier Bees {[email protected] DONE}
AttributeFix-1.15.2-7.0.2.jar AttributeFix {[email protected] DONE}
no-nitwits-1.15.2-1.0.0.jar No Nitwits {[email protected] DONE}
extrabows-v1.15.2+b2.jar Extra Bows {[email protected] b2 DONE}
caelus-FORGE-1.15.2-2.0-beta2.jar Caelus API {[email protected] DONE}
Upgrade-Aquatic-1.15.2-v1.5.1.jar Upgrade Aquatic {[email protected] DONE}
colytra-FORGE-1.15.2-3.0.jar Colytra {[email protected] DONE}
bloomful-1.15.2-1.3.2.jar Bloomful {bloomful@NONE DONE}
extraboats-1.3.4-1.15.2.jar Extra Boats {[email protected] DONE}
BowInfinityFix-1.15.2-rv8.jar Bow Infinity Fix {bowinfinityfix@rv8 DONE}
ForgeEndertech-1.15.2-6.0.2.2-build.0030.jar Forge Endertech {[email protected] DONE}
AdFinders-1.15.2-4.0.5.0-build.0020.jar Advanced Finders {[email protected] DONE}
RingOfRepair-1.15.2-1.1.26.jar Ring of Repair {[email protected] DONE}
OresAboveDiamonds+1.15.2+v4.0.jar Ores Above Diamonds {[email protected] DONE}
JRFTL+[1.15.2]-1.1.jar JRFTL {[email protected] DONE}
journeymap-1.15.2-5.7.0beta1.jar Journeymap {[email protected] DONE}
WorldTweaker-1.0.jar World Tweaker {[email protected] DONE}
VanillaTweaks-1.15.2.1.5.21.jar VanillaTweaks {[email protected] DONE}
DungeonCrawl-1.15.2-1.6.3.jar Dungeon Crawl {[email protected] DONE}
Bookshelf-1.15.2-5.4.14.jar Bookshelf {[email protected] DONE}
BedBenefits-1.15.2-1.0.4.jar BedBenefits {[email protected] DONE}
RingOfTeleport-1.15.2-1.1.25.jar Ring of Teleport {[email protected] DONE}
SnowRealMagic-1.15.2-1.7.5.jar Snow! Real Magic! {[email protected] DONE}
Kiwi-1.15.2-2.7.0.jar Kiwi {[email protected] DONE}
carpetstairsmod-1.4.2.jar Carpet Stairs Mod {[email protected] DONE}
VTweaks-1.15.2-3.1.6 (1).jar V-Tweaks {[email protected] DONE}
swampexpansion-1.15.2-1.5.1 (1).jar Swamp Expansion {swampexpansion@NONE DONE}
strongfarmland-1.15.2-1.0.0.jar Stronger Farmland Mod {[email protected] DONE}
forge-1.15.2-31.1.63-universal.jar Forge {[email protected] DONE}
respawnablepets-1.0.6.3.jar Respawnable Pets {[email protected] DONE}
JustNeeded-1.15.2-1.1.1.jar Just Needed {[email protected] DONE}
corpse-1.15.2-1.0.3.jar Corpse {[email protected] DONE}
forge-1.15.2-31.1.63-server.jar Minecraft {[email protected] DONE}
logprot-1.15.1-1.2.jar Logprot {[email protected] DONE}
EnchantmentDescriptions-1.15.2-2.0.5.jar EnchantmentDescriptions {[email protected] DONE}
EasySteel-1.15.2-1.1.68.jar Easy Steel & More {[email protected] DONE}
valhelsia_structures-15.0.2a (1).jar Valhelsia Structures {[email protected] DONE}
ironfurnaces-1.15.2-2.0.3.jar Iron Furnaces {[email protected] DONE}
packedup-1.0.10-mc1.15.jar PackedUp {[email protected] DONE}
atmospheric-1.15.2-1.2.1.jar Atmospheric {[email protected] DONE}
simplybackpacks-1.15.2-1.4.5.jar Simply Backpacks {[email protected] DONE}
extragolems-10.1.0.jar Extra Golems {[email protected] DONE}
dimdungeons-1.05-forge-1.15.2.jar Dimensional Dungeons {[email protected] DONE}
curios-FORGE-1.15.2-2.0.2.2.jar Curios API {[email protected] DONE}
Patchouli-1.15.2-1.2-32.jar Patchouli {[email protected] DONE}
autumnity-1.2.0-1.15.2.jar Autumnity {[email protected] DONE}
corail_recycler-4.0.4-1.15.2.jar Corail Recycler {[email protected] DONE}
AutoRegLib-1.5-40.jar AutoRegLib {[email protected] DONE}
Quark-r2.1-235.jar Quark {[email protected] DONE}
performant-1.15-2.07m.jar Performant {[email protected] DONE}
DoubleSlabs-1.15-2.2.6.jar Double Slabs {[email protected] DONE}
structurize-0.10.305-ALPHA.jar Structurize {[email protected] DONE}
expandedstorage-1.1.8+1.15.2.jar Expanded Storage {[email protected]+1.15.2 DONE}
PowderPower-1.15.2-3.1.60.jar Powder Power {[email protected] DONE}
minecolonies-0.11.886-BETA-universal.jar Minecolonies {[email protected] DONE}
mcw-roofs-1.0.2-mc1.15.2_1.15.1.jar Macaw's Roofs {[email protected] DONE}
globalxp-1.15.2-v1.4.11.jar Global XP {[email protected] DONE}
RingOfAttraction-1.15.2-1.1.29.jar Ring of Attraction {[email protected] DONE}
Zmod+1.15.2-1.05.jar ZmodSkills {[email protected] DONE}
Aquaculture-1.15.2-2.0.13.jar Aquaculture 2 {[email protected] DONE}
tramplestopper-1.15.2-2.0.0.1-universal.jar Trample Stopper {[email protected] DONE}
betterbedrockgenerator-1.15.2-0.0.6.jar Better Bedrock Generator {[email protected] DONE}
incubation-1.0.2-1.15.2.jar Incubation {[email protected] DONE}
FastLeafDecay-v22.jar FastLeafDecay {fastleafdecay@v22 DONE}
Disenchanting_(forge)_1.15.2-1.2.0.jar Disenchanting {[email protected] DONE}
leavesdecayonotherleaves-1.1.jar Leaves Decay on other Leaves {[email protected] DONE}
lootbagmod-1.15.1-1.5.3.jar Loot Bag Mod {[email protected] DONE}
Cyclic-1.15.2-0.4.0.jar Cyclic {[email protected] DONE}
Kiwi Modules:
kiwi:contributors
snowrealmagic:snowrealmagic
Player Count: 1 / 20; [ServerPlayerEntity['LordBaane'/607, l='world', x=-114.99, y=64.00, z=164.96]]
Data Packs: vanilla, mod:adfinders (incompatible), mod:advskinmod (incompatible), mod:aquaculture, mod:atmospheric, mod:attributefix (incompatible), mod:autoreglib (incompatible), mod:autumnity, mod:bambooblocks (incompatible), mod:berry_good (incompatible), mod:betterbedrockgenerator, mod:bloomful (incompatible), mod:bookshelf (incompatible), mod:bowinfinityfix (incompatible), mod:buzzierbees, mod:caelus (incompatible), mod:carpetstairsmod, mod:colytra (incompatible), mod:corail_recycler, mod:corpse, mod:curios (incompatible), mod:cyclic (incompatible), mod:damage_indicator (incompatible), mod:dimdungeons, mod:disenchanting (incompatible), mod:doubleslabs, mod:dungeoncrawl (incompatible), mod:easy_steel (incompatible), mod:enchdesc (incompatible), mod:expandedstorage (incompatible), mod:extraboats, mod:extratrades, mod:fastleafdecay, mod:forge (incompatible), mod:forgeendertech (incompatible), mod:globalxp (incompatible), mod:golems (incompatible), mod:incubation, mod:ironfurnaces (incompatible), mod:jei (incompatible), mod:journeymap (incompatible), mod:jrftl (incompatible), mod:justneeded (incompatible), mod:kiwi, mod:leavesdecayonotherleaves, mod:logprot (incompatible), mod:lootbagmod (incompatible), mod:mining_helmet (incompatible), mod:no_nitwits (incompatible), mod:oresabovediamonds (incompatible), mod:patchouli (incompatible), mod:powder_power (incompatible), mod:prefab, mod:quark, mod:respawnablepets, mod:ring_of_attraction (incompatible), mod:ring_of_repair (incompatible), mod:ring_of_teleport (incompatible), mod:simplybackpacks (incompatible), mod:snowrealmagic, mod:swampexpansion (incompatible), mod:tramplestopper (incompatible), mod:upgrade_aquatic (incompatible), mod:valhelsia_structures (incompatible), mod:vanillatweaks, mod:vtweaks (incompatible), mod:zmod, mod:performant (incompatible), mod:packedup, mod:strongfarmland (incompatible), mod:bedbenefits (incompatible), mod:extrabows (incompatible), mod:mcwroofs, mod:minecolonies (incompatible), mod:structurize (incompatible), mod:worldtweaker
Is Modded: Definitely; Server brand changed to 'forge'
Type: Dedicated Server (map_server.txt)

Jup, I used a client side method. 🤦🏼‍♂️
I fixed it in version 1.0.11.