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Issue Description: Dynmap shows Java Exeptions during boot up from Paper 1.18.2

• Dynmap Version: Loading dynmap v3.3-beta-2-577
• Server Version: Paper version git-Paper-231 (MC: 1.18.2) (Implementing API version 1.18.2-R0.1-SNAPSHOT) (Git: a36d7f6)
• Pastebin of Configuration.txt: not neccessarry
• Server Host (if applicable): Selfhosted
• Pastebin of crashlogs or other relevant logs: https://pastebin.com/TfvrkGbD
• Other Relevant Data/Screenshots: This issue occurs also without any config and any other plugins.
• Steps to Replicate: Setup an Paper 1.18.2 Server, load it with dynmap newest release and see the error in console

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

3.3 is not compatible with 1.18.2, to get 1.18.2 to work you have to use either the snapshots or betas.

Can confirm - with the new snapshot Dynmap-3.4-beta-2-spigot.jar it is working:

[13:25:48] [Server thread/INFO]: [dynmap] Enabling dynmap v3.4-beta-2-764 [13:25:50] [Server thread/INFO]: [dynmap] Added 18 custom biome mappings [13:25:50] [Server thread/INFO]: [dynmap] Using GroupManager 3.3 for access control [13:25:51] [Server thread/INFO]: [dynmap] Extracted files upgraded [13:25:51] [Server thread/INFO]: [dynmap] Mod Support processing completed [13:25:58] [Server thread/INFO]: [dynmap] Updated file plugins/dynmap/shaders.txt [13:26:05] [Server thread/INFO]: [dynmap] Loaded 27 shaders. [13:26:06] [Server thread/INFO]: [dynmap] Updated file plugins/dynmap/perspectives.txt [13:26:06] [Server thread/INFO]: [dynmap] Loaded 83 perspectives. [13:26:06] [Server thread/INFO]: [dynmap] Loaded 22 lightings. [13:26:06] [Server thread/INFO]: [dynmap] Starting enter/exit processing [13:26:06] [Dynmap Render Thread/INFO]: [dynmap] Finish marker initialization [13:26:07] [Server thread/INFO]: [dynmap] Web server started on address 0.0.0.0:8123 [13:26:07] [Server thread/INFO]: [dynmap] version 3.4-beta-2-764 is enabled - core version 3.4-beta-2-764 [13:26:07] [Server thread/INFO]: [dynmap] For support, visit our Discord at https://discord.gg/s3rd5qn [13:26:07] [Server thread/INFO]: [dynmap] For news, visit https://reddit.com/r/Dynmap or follow https://twitter.com/Dynmap [13:26:07] [Server thread/INFO]: [dynmap] To report or track bugs, visit https://github.com/webbukkit/dynmap/issues [13:26:07] [Server thread/INFO]: [dynmap] If you'd like to donate, please visit https://www.patreon.com/dynmap or https://ko-fi.com/michaelprimm [13:26:07] [Server thread/INFO]: [dynmap] Loaded 2 maps of world 'Bauwelt'. [13:26:07] [Server thread/INFO]: [dynmap] Enabled

Thank you! :)