Restart the server, open the console and find the first line that names the plugin. Check that the file is a Paper or Bukkit plugin, supports your Minecraft version, has every required dependency, and is not duplicated. Do not install several replacement files at once.
1. Read the first relevant console error
Paper writes plugin-loading problems to the startup console and logs/latest.log. Start near the beginning of the latest startup, search for the plugin name, and read the exception immediately below it. The first useful line is normally more valuable than the hundreds of stack-trace lines that follow.
2. Confirm that it is a plugin, not a mod
Paper and Purpur load Bukkit or Paper plugins. Fabric, Forge and NeoForge load mods. A Fabric or Forge JAR placed in the Paper plugins folder will not become compatible. If your group needs client-side and server-side mods, start with the Minecraft server mods guide instead.
3. Match the server and plugin versions
Check the plugin's official project page for the supported Minecraft versions and server software. “Latest” does not always mean “works with every server.” If the author lists only Paper support, do not assume Folia support; the Paper vs Folia guide explains why.
4. Install the missing dependency
An UnknownDependencyException normally names another plugin that must load first, such as Vault or ProtocolLib. Install the required dependency from its official page, confirm it supports the same server version, then restart. Do not download a random file with a similar name.
5. Remove duplicate plugin versions
Keep one JAR for each plugin. Two EssentialsX versions, for example, can produce an “ambiguous plugin name” error. Stop the server, keep the compatible release, remove the duplicate, and start again.
6. Check the filename and folder
The plugin must be a complete .jar file in the root of the plugins folder. Paper does not scan nested plugin folders for JARs. If the download arrived as a ZIP, read the project instructions and extract the correct Paper or Bukkit JAR first.
7. Isolate the plugin safely
Stop the server and take a backup before changing server files. Remove or disable only the suspected plugin, then start the server. If the problem disappears, check that plugin's update history, dependencies and documentation. For a larger set, Paper recommends a binary search: disable half, test, and repeat while keeping dependent plugins together.
Troubleshoot from ChunkArc Manage
Open the live console in ChunkArc Manage, restart once, and note the first named error. The plugin catalogue filters projects by server software and version. Installed plugins with supported configuration files also expose a guarded editor, so you can fix a YAML or JSON setting without opening a general file manager.
If the server itself refuses to start after removing the plugin, use the broader server connection and startup checklist. For a clean first installation, follow how to install Minecraft plugins safely.
Use compatible plugins from the start
Create a Paper or Purpur server and use the filtered plugin catalogue, live console and configuration controls in ChunkArc Manage.
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