... 13 more
[18:01:35 ERROR]: Could not load 'plugins\core-1.0-SNAPSHOT.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: net/samagames/api/pubsub/IPacketsReceiver
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:326) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:248) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.loadPlugins(CraftServer.java:298) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.reload(CraftServer.java:743) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at org.bukkit.Bukkit.reload(Bukkit.java:525) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:25) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:641) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchServerCommand(CraftServer.java:627) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at net.minecraft.server.v1_12_R1.DedicatedServer.aP(DedicatedServer.java:443) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:678) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_191]
Caused by: java.lang.NoClassDefFoundError: net/samagames/api/pubsub/IPacketsReceiver
        at java.lang.Class.forName0(Native Method) ~[?:1.8.0_191]
        at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_191]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        ... 14 more
Caused by: java.lang.ClassNotFoundException: net.samagames.api.pubsub.IPacketsReceiver
        at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_191]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_191]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_191]
        at java.lang.Class.forName0(Native Method) ~[?:1.8.0_191]
        at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_191]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
        ... 14 more