say and tell commands don't seem to go right

[Enderman-Teleporting]

This is what the console prints when say hello is executed:

[21:05:16] [Server thread/INFO]: [Server] hello
[21:05:16] [Server thread/INFO]: An unexpected error occurred trying to execute that command

And no more log output

fabric: fabric-server-mc.1.21.11-loader.0.19.3-launcher.1.1.1

full log (i noticed that there is an IndexOutOfBoundsException, is it relevant to this problem?):

[21:04:55] [main/INFO]: Loading Minecraft 1.21.11 with Fabric Loader 0.19.3
[21:04:55] [main/INFO]: Loading 57 mods:
	- cardboard 11
	   |-- fabric-permissions-api-v0 0.5.0
	   |-- io_leangen_geantyref_geantyref 1.3.16
	   |-- io_papermc_reflection-rewriter 0.0.3
	   |-- io_papermc_reflection-rewriter-proxy-generator 0.0.3
	   |-- io_papermc_reflection-rewriter-runtime 0.0.3
	   |-- net_fabricmc_mapping-io 0.8.0
	   |-- net_md-5_specialsource 1.11.2
	   |-- net_neoforged_autorenamingtool 2.0.3
	   |-- net_neoforged_installertools_cli-utils 2.1.4
	   |-- net_neoforged_srgutils 1.0.9
	   |-- org_spongepowered_configurate-core 4.2.0
	   \-- org_spongepowered_configurate-hocon 4.2.0
	- fabric-api 0.141.5+1.21.11
	   |-- fabric-api-base 1.0.5+4ebb5c083e
	   |-- fabric-api-lookup-api-v1 1.6.114+20dc27073e
	   |-- fabric-biome-api-v1 17.1.1+4fc5413f3e
	   |-- fabric-block-api-v1 1.1.10+4ebb5c083e
	   |-- fabric-block-view-api-v2 1.0.39+4ebb5c083e
	   |-- fabric-command-api-v2 2.4.7+6b42a6003e
	   |-- fabric-content-registries-v0 10.2.14+4fc5413f3e
	   |-- fabric-convention-tags-v1 2.1.55+7f945d5b3e
	   |-- fabric-convention-tags-v2 2.17.3+8ef948ba3e
	   |-- fabric-crash-report-info-v1 0.3.23+4ebb5c083e
	   |-- fabric-data-attachment-api-v1 1.8.48+eed0806f3e
	   |-- fabric-data-generation-api-v1 23.5.0+88d7da613e
	   |-- fabric-dimensions-v1 4.0.28+4fc5413f3e
	   |-- fabric-entity-events-v1 3.1.1+1d0ab4303e
	   |-- fabric-events-interaction-v0 4.1.1+3b89ecf63e
	   |-- fabric-game-rule-api-v1 2.0.3+4fc5413f3e
	   |-- fabric-item-api-v1 11.5.20+d0c46b9e3e
	   |-- fabric-item-group-api-v1 4.2.36+4fc5413f3e
	   |-- fabric-key-binding-api-v1 1.1.7+4fc5413f3e
	   |-- fabric-lifecycle-events-v1 2.6.15+4ebb5c083e
	   |-- fabric-loot-api-v2 3.0.73+3f89f5a53e
	   |-- fabric-loot-api-v3 2.0.20+78c8b4663e
	   |-- fabric-message-api-v1 6.1.12+4ebb5c083e
	   |-- fabric-model-loading-api-v1 6.0.15+4fc5413f3e
	   |-- fabric-networking-api-v1 5.1.6+6b6d71a53e
	   |-- fabric-object-builder-api-v1 21.1.40+4fc5413f3e
	   |-- fabric-particles-v1 4.2.12+4fc5413f3e
	   |-- fabric-recipe-api-v1 8.2.4+4ebb5c083e
	   |-- fabric-registry-sync-v0 6.2.6+1718722b3e
	   |-- fabric-renderer-api-v1 8.0.3+f4ffd2e53e
	   |-- fabric-renderer-indigo 5.0.3+f4ffd2e53e
	   |-- fabric-rendering-fluids-v1 3.1.43+4ebb5c083e
	   |-- fabric-rendering-v1 16.2.10+0290ad933e
	   |-- fabric-resource-conditions-api-v1 5.0.35+4fc5413f3e
	   |-- fabric-resource-loader-v0 3.3.4+4fc5413f3e
	   |-- fabric-resource-loader-v1 1.0.10+78c8b4663e
	   |-- fabric-screen-api-v1 3.1.7+4ebb5c083e
	   |-- fabric-screen-handler-api-v1 1.3.162+4fc5413f3e
	   |-- fabric-serialization-api-v1 1.0.5+4ebb5c083e
	   |-- fabric-sound-api-v1 1.0.51+4fc5413f3e
	   |-- fabric-tag-api-v1 1.3.0+88d7da613e
	   |-- fabric-transfer-api-v1 6.0.25+4fc5413f3e
	   \-- fabric-transitive-access-wideners-v1 7.1.0+014c8cec3e
	- fabricloader 0.19.3
	   \-- mixinextras 0.5.4
	- icommon-bundle 107
	   \-- icommon 107+1.21.9
	        \-- icommon-api-configuration 1.0
	- java 21
	- minecraft 1.21.11
[21:04:55] [main/INFO]: SpongePowered MIXIN Subsystem Version=0.8.7 Source=file:/C:/Users/Lenovo/Desktop/Exless%20survival/libraries/net/fabricmc/sponge-mixin/0.17.3+mixin.0.8.7/sponge-mixin-0.17.3+mixin.0.8.7.jar Service=Knot/Fabric Env=SERVER
[21:04:55] [main/INFO]: Compatibility level set to JAVA_21
[21:04:55] [main/INFO]: Loading Libraries...
[21:04:55] [main/INFO]: Loaded 16 libraries. Paper-API: 1.21.11-59; bungeecord-chat-1.21-R0.2; adventure-api-4.25.0;  (8)
[21:04:55] [main/INFO]: Index 1 out of bounds for length 1
[21:04:55] [main/INFO]: Index 1 out of bounds for length 1
[21:04:56] [main/INFO]:  iCommonLib (for 1.21.11) - Common Code for mods. Copyright (c) 2018-2026 Isaiah.
[21:04:56] [main/INFO]: Applying mixin: MixinMinecraftServer...
[21:04:56] [main/INFO]: Applying mixin: MixinMinecraftServer...
[21:04:56] [main/INFO]: Applying mixin: MixinBlockState...
[21:04:56] [main/INFO]: Applying mixin: MixinBlockItem...
[21:04:56] [main/INFO]: Applied 23 mixins.
[21:04:56] [main/INFO]: Applying Mixin: R1_21.MixinNetherPortalBlock_10...
[21:04:56] [main/INFO]: Initializing MixinExtras via com.llamalad7.mixinextras.service.MixinExtrasServiceImpl(version=0.5.4).
[21:05:03] [main/INFO]: Cardboard - Minecraft 1.21.11 - Paper-API 1.21.11-59. Registered '8' iCommon events.
[21:05:03] [main/INFO]: iCommon Mod initialized.
[21:05:03] [main/INFO]: Environment: Environment[sessionHost=https://sessionserver.mojang.com, servicesHost=https://api.minecraftservices.com, profilesHost=https://api.mojang.com, name=PROD]
[21:05:05] [main/INFO]: Loaded 1470 recipes
[21:05:05] [main/INFO]: Loaded 1584 advancements
[21:05:05] [main/INFO]: Applied 0 biome modifications to 0 of 65 new biomes in 1.794 ms
[21:05:06] [Server thread/INFO]: Setting IServer instance..
[21:05:06] [Server thread/INFO]: Starting minecraft server version 1.21.11
[21:05:06] [Server thread/INFO]: Loading properties
[21:05:06] [Server thread/INFO]: Default game type: SURVIVAL
[21:05:06] [Server thread/INFO]: DEB: 2121
[21:05:06] [Server thread/INFO]: This server is running Cardboard version 11 (Implementing API version 1.21.11-R0.1-SNAPSHOT)
[21:05:06] [Server thread/INFO]: Loading Bukkit plugins...
[21:05:06] [Server thread/INFO]: RemapUtils Exporting Mojang Mappings...
[21:05:06] [Server thread/INFO]: RemapUtils RemapUtils: MyMappingResolver Namespace: intermediary
[21:05:07] [Server thread/INFO]: RemapUtils Read 4325 classes from bukkit-1.21.10-cl.csrg
[21:05:07] [Server thread/INFO]: 
[21:05:07] [Server thread/INFO]: Generating keypair
[21:05:07] [Server thread/INFO]: Starting Minecraft server on *:25565
[21:05:07] [Server thread/INFO]: Preparing level "world"
[21:05:07] [Server thread/INFO]: Setting IWorld for world "world"
[21:05:07] [Server thread/INFO]: Setting IWorld for world "world_the_end"
[21:05:07] [Server thread/INFO]: Setting IWorld for world "world_nether"
[21:05:07] [Server thread/INFO]: Loading 0 persistent chunks...
[21:05:07] [Server thread/INFO]: Preparing spawn area: 100%
[21:05:07] [Server thread/INFO]: Time elapsed: 66 ms
[21:05:07] [Server thread/INFO]: Selecting global world spawn...
[21:05:07] [Server thread/INFO]: Selecting global world spawn...
[21:05:08] [Server thread/INFO]: Done (0.763s)! For help, type "help"
[21:05:16] [Server thread/INFO]: BROADCAST DEBUG: hello
[21:05:16] [Server thread/INFO]: [Server] hello
[21:05:16] [Server thread/INFO]: An unexpected error occurred trying to execute that command
[21:06:08] [Server thread/INFO]: Server empty for 60 seconds, pausing

[KostiaFed]

Fixed in #590 @pisaiah. Please close this issue