You may need to copy some of the following configs to fix the issue on your server:

commands.yml
punish.yml
en_us.lang.yml

11.0.1.0

• Fixed some unexpected issues with the multiple enemies feature.
• Fixed some missing placeholders in the default files.
• Fixed death messages not having valid enemy placeholders.

11.0.0.3

• Created PlayerParticles Compatibility expansion
• More information can be found on the documentation page.