[ERROR]:
Could not load 'plugins/VoidSpawn.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: Unsupported API version 1.18

mohistversion #886

Your not using the latest version of Minecraft. For 1.18 and below you will need to download the older version. https://www.spigotmc.org/resources/voidspawn.19350/history.

thanks