Cannot get items out of barrels

[cybermancerr]

Error generated by Slimefun: https://pastebin.com/zJdkxNuQ

Java Environment:
Operating System: Linux
Java Version: 1.8.0_242

Server Software: Paper
Build: git-Paper-84 (MC: 1.15.2)
Minecraft: 1.15.2-R0.1-SNAPSHOT

Slimefun Environment:
CS-CoreLib vDEV - 80 (git e3242c60)
Slimefun vDEV - 414 (git d37b1504)

Installed Addons (13)

• Barrels DEV - 8 (git 447cb48)
• SlimeXpansion DEV - 4 (git 5bf10c29)
• ExtraGear DEV - 3 (git de222ab7)
• HotbarPets DEV - 23 (git 37b50104)
• ExoticGarden DEV - 25 (git b5fce971)
• SoulJars DEV - 10 (git 58202ab6)
• SlimefunOreChunks DEV - 3 (git 7ddf966e)
• SlimefunOres 1.4.6
• ElectricSpawners DEV - 6 (git 845b6076)
• ExtraHeads DEV - 9 (git 32435a1f)
• SlimyTreeTaps DEV - 5 (git 6dd80630)
• PrivateStorage DEV - 8 (git 6b242fc5)
• DyedBackpacks DEV - 1 (git 4b4d1f0f)

Installed Plugins (71):

• PlaceholderAPI 2.10.4
• RealDualWield 1.1.27
• OldCombatMechanics 1.7.5BETA
• HubCommand 1.1
• LagAssist 2.20.1
• WorldEdit 7.1.0;8e55131
• OpenInv 4.0.8
• MineableSpawners 2.0.8
• SkinnerLibs 1.0-SNAPSHOT
• ClearLag 3.1.0
• WorldBorder 1.9.10 (beta)
• Votifier 2.6.0-SNAPSHOT
• NightVision 2.0
• VotingPlugin 5.20.5
• AsyncWorldEdit 3.6.18
• Minepacks 2.1.5-Release
• PermissionsEx 1.23.4
• LimitPillagers 2.12.0
• NerfPhantoms 1.2.0
• CS-CoreLib DEV - 80 (git e3242c60)
• Vault 1.7.2-b107
• ProtocolSupport 4.29-dev
• Cannons 2.5.5
• WorldGuard 7.0.2-SNAPSHOT;bf2593e
• Slimefun DEV - 414 (git d37b1504)
• Barrels DEV - 8 (git 447cb48)
• ViaVersion 2.2.3
• ViaBackwards 2.4.0-SNAPSHOT
• SlimeXpansion DEV - 4 (git 5bf10c29)
• Essentials 2.17.1.52
• ExtraGear DEV - 3 (git de222ab7)
• SafeTrade 1.1.0
• ProtocolLib 4.5.1-SNAPSHOT-b445
• LibsDisguises 9.8.9-SNAPSHOT
• MythicDrops 5.1.2-5e3274b
• DiscordSRV 1.18.4
• HotbarPets DEV - 23 (git 37b50104)
• EssentialsChat 2.17.1.52
• ExoticGarden DEV - 25 (git b5fce971)
• TimeIsMoney 1.9.6.11
• KeepChunks 1.6.2
• XPBoost 3.3.0
• mcMMO 2.1.114
• SoulJars DEV - 10 (git 58202ab6)
• ViaRewind 1.4.5
• EnjinMinecraftPlugin 3.5.7
• SlimefunOreChunks DEV - 3 (git 7ddf966e)
• SlimefunOres 1.4.6
• ElectricSpawners DEV - 6 (git 845b6076)
• Movecraft 7.0.0_beta_2
• HolographicDisplays 2.4.1
• ExtraHeads DEV - 9 (git 32435a1f)
• SlimyTreeTaps DEV - 5 (git 6dd80630)
• PrivateStorage DEV - 8 (git 6b242fc5)
• DyedBackpacks DEV - 1 (git 4b4d1f0f)
• AAC 4.3.5
• AuctionHouse 2.0.0
• Factions 1.6.9.5-U0.5.7-b215
• MythicMobs 4.9.0-SNAPSHOT-3186
• JetsMinions 5.6.15
• EssentialsSpawn 2.17.1.52
• CratesPlus 4.5.2
• WorldGuardExtraFlags 4.1.2
• MyPet 3.1
• ChatControl 8.5.4
• Jobs 4.15.2
• RandomTP 1.0.7.2
• ActionHealth 3.4.2
• Skinner 4.2.0
• RPGHealthPlus 1.4.8
• CrazyEnvoy 1.3.8-RELEASE

[KillerXCoder]

same problem, latest build -> https://imgur.com/a/pwcG4w8 but i am not getting any errors in console