The reason why the plugin is not working usually appears in the startup log. Find the first load error with the relevant plugin, not the last chain error.
Step by step
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Look at the plugin name and
ERRORlines in thelogs/latest.logfile. Missing dependencies, incompatible Java or incorrect configuration require different solutions. -
Verify that the jar file is in the correct folder and for the correct platform. Don't release two different versions of the same plugin.
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If it is a configuration error, backup your own file first. Just fix the specified key or indent and reboot regularly.
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Test the install line and the corresponding command. If the command exists but it doesn't work in the normal player, check the permission system.
Keep in mind
Deleting the entire plugin directory in production may result in loss of data and settings.