nukkit plugin development

I have a problem that no plugins are recognized on the server. InvSee and others are not displayed

First of all, I would like to introduce myself. I'm a server owner with a nametag that goes as "SkilasticYT", And I'm looking for a developer to develop plugins for my server. Anyways, I had an idea to create a sky wars server for Minecraft-Bedrock-Edition. I'm making this forum because I cannot...