Bukkit

Hello, started my server and plugin couldn't be loaded. Here is the error code: [13:56:19] [Server thread/ERROR]: Could not load 'plugins/ThePerWorldInventory.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: me/DevTec/TheAPI/ConfigAPI/Config
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[patched_1.8.8.jar:git-PaperSpigot-445]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:331) ~[patched_1.8.8.jar:git-PaperSpigot-445]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:254) [patched_1.8.8.jar:git-PaperSpigot-445]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.java:293) [patched_1.8.8.jar:git-PaperSpigot-445]
at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:202) [patched_1.8.8.jar:git-PaperSpigot-445]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:563) [patched_1.8.8.jar:git-PaperSpigot-445]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]
Caused by: java.lang.NoClassDefFoundError: me/DevTec/TheAPI/ConfigAPI/Config
at me.DevTec.PWI.Loader.<clinit>(Loader.java:15) ~[?:?]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_312]
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_312]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:65) ~[patched_1.8.8.jar:git-PaperSpigot-445]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[patched_1.8.8.jar:git-PaperSpigot-445]
... 6 more
Caused by: java.lang.ClassNotFoundException: me.DevTec.TheAPI.ConfigAPI.Config
at java.net.URLClassLoader.findClass(URLClassLoader.java:387) ~[?:1.8.0_312]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:102) ~[patched_1.8.8.jar:git-PaperSpigot-445]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:87) ~[patched_1.8.8.jar:git-PaperSpigot-445]
at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_312]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_312]
at me.DevTec.PWI.Loader.<clinit>(Loader.java:15) ~[?:?]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_312]
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_312]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:65) ~[patched_1.8.8.jar:git-PaperSpigot-445]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[patched_1.8.8.jar:git-PaperSpigot-445]
... 6 more