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Issue Description: Dynmap sample issue description. This description would include as much and as little detail necessary for us to understand the issue in its entirety.

• Dynmap Version: Dynmap-3.1-beta7-spigot.jar
• Server Version: https://github.com/Loli-Server/LoliServer I use this sever
• Pastebin of Configuration.txt: https://pastebin.com/A05TUtiG
• Pastebin of crashlogs or other relevant logs: https://pastebin.com/U7SJ3jFk
• Other Relevant Data/Screenshots: I'm using this texture pack and these plugins and my map is from alpha .8
• Steps to Replicate:
• The OP: /dynmap
• The Sever:An Internal error occurred while attempting to perform this command

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