Dynmap Version: Dynmap-3.1-beta6-spigot.jar
Server Version: paper 1.16.5 build 386 and 418.
Pastebin of Configuration.txt: https://pastebin.com/Mm49GtFS
Server Host (if applicable): Self-hosted and managed with Amp
Pastebin of crashlogs or other relevant logs:
w/all plugins installed on server: https://pastebin.com/Z95LFBDK
w/only Dynmap installed on server https://pastebin.com/fyAw123J
Other Relevant Data/Screenshots: I'm using :
Plugins (32): AdvancedPortals, AdvancedReporter, Autorank, BedrockPlayerManager, BungeeChatBridge*, ChatManager, Citizens, CommandSync*, dynmap*, Essentials, EssentialsMysqlStorage, EssentialsSpawn, ExtraContexts, floodgate-bukkit, HolographicDisplays, LuckPerms, MoreCommands*, Multiverse-Core, Multiverse-Portals, Multiverse-SignPortals, MysqlPlayerDataBridge, NamelessMC, PlaceholderAPI, Plot2Dynmap, PlotSquared, Realistic_World, Vault, ViaBackwards, ViaVersion, WorldBorder, WorldEdit, WorldGuard

Steps to Replicate: Occurs on server start. Occurs when running with only Dynmap enabled on server.

[ X] I have looked at all other issues and this is not a duplicate
[ X] I have been able to replicate this

Closing this due to age, this was fixed in a later version.