Miért nem engedi berakni a minecraft szerverem a pluginokat?

Amikor beakarok rakni valamilyen plugint az 1.12es spigot szerverembe ezt írja:

org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: com/pzg/www/api/config/ConfigCreate

at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[spigot.jar:git-Spigot-596221b-9a1fc1e]

at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:326) ~[spigot.jar:git-Spigot-596221b-9a1fc1e]

at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:248) [spigot.jar:git-Spigot-596221b-9a1fc1e]

at org.bukkit.craftbukkit.v1_12_R1.CraftServer.loadPlugins(CraftServer.java:298) [spigot.jar:git-Spigot-596221b-9a1fc1e]

at org.bukkit.craftbukkit.v1_12_R1.CraftServer.reload(CraftServer.java:743) [spigot.jar:git-Spigot-596221b-9a1fc1e]

at org.bukkit.Bukkit.reload(Bukkit.java:525) [spigot.jar:git-Spigot-596221b-9a1fc1e]

at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:25) [spigot.jar:git-Spigot-596221b-9a1fc1e]

at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) [spigot.jar:git-Spigot-596221b-9a1fc1e]

at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:641) [spigot.jar:git-Spigot-596221b-9a1fc1e]

at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchServerCommand(CraftServer.java:627) [spigot.jar:git-Spigot-596221b-9a1fc1e]

at net.minecraft.server.v1_12_R1.DedicatedServer.aP(DedicatedServer.java:443) [spigot.jar:git-Spigot-596221b-9a1fc1e]

at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spigot.jar:git-Spigot-596221b-9a1fc1e]

at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:678) [spigot.jar:git-Spigot-596221b-9a1fc1e]

at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot.jar:git-Spigot-596221b-9a1fc1e]

at java.lang.Thread.run(Unknown Source) [?:1.8.0_251]

Caused by: java.lang.NoClassDefFoundError: com/pzg/www/api/config/ConfigCreate

at java.lang.Class.forName0(Native Method) ~[?:1.8.0_251]

at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_251]

at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot.jar:git-Spigot-596221b-9a1fc1e]

at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot.jar:git-Spigot-596221b-9a1fc1e]

... 14 more

Caused by: java.lang.ClassNotFoundException: com.pzg.www.api.config.ConfigCreate

at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_251]

at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot.jar:git-Spigot-596221b-9a1fc1e]

at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-596221b-9a1fc1e]

at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251]

at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251]

at java.lang.Class.forName0(Native Method) ~[?:1.8.0_251]

at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_251]

at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot.jar:git-Spigot-596221b-9a1fc1e]

at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot.jar:git-Spigot-596221b-9a1fc1e]