error at boot up

[Ironic8b498]

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**Issue Description: Error occurred while enabling dynmap v3.7-SNAPSHOT-948 (Is it up to date?)

• **Dynmap Version: Dynmap-3.7-beta-7-spigot
• **Server Version: Paper 1.21.4
• **Pastebin of Configuration.txt: https://paste.helpch.at/exaqamirah.yaml
• **Server Host (if applicable): Linux at home
• **Pastebin of crashlogs or other relevant logs: https://paste.helpch.at/iravuxekak.php
• Other Relevant Data/Screenshots: I'm using this texture pack and these plugins and my map is from alpha .8
• Steps to Replicate: Please be clear in this section so we can replicate your issue

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

[antiLimited]

It's probably because 3.7 beta 7 only supports 1.21.1