Bukkit

What steps will reproduce the problem?
1. Put RoleplayCards.jar in folder "Plugins"
2. Launch the server
3. I get the error

What version of the product are you using?

Cauldron server 1.7.2

Do you have an error log of what happened?

[13:15:06] [Server thread/ERROR]: Could not load 'plugins/GuiRoleplayCards.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException Cannot find main class `xyz.undeaD_D.RPC.RPC'
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:172) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:145) ~[JavaPluginLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:314) ~[SimplePluginManager.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:236) [SimplePluginManager.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugins(CraftServer.java:299) [CraftServer.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at net.minecraft.world.storage.SaveHandler.initBukkitData(SaveHandler.java:438) [axc.class]
at net.minecraft.world.storage.SaveHandler.func_75757_d(SaveHandler.java:136) [axc.class]
at net.minecraft.world.World.<init>(World.java:353) [afn.class]
at net.minecraft.world.WorldServer.<init>(WorldServer.java:152) [mj.class]
at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:345) [MinecraftServer.class]
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:310) [lj.class]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:599) [MinecraftServer.class]
at java.lang.Thread.run(Thread.java:745) [?:1.7.0_76]
Caused by: java.lang.ClassNotFoundException Failed to remap class xyz.undeaD_D.RPC.RPC
at org.bukkit.plugin.java.PluginClassLoader.remappedFindClass(PluginClassLoader.java:447) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:368) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:192) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_76]
at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_76]
at java.lang.Class.forName0(Native Method) ~[?:1.7.0_76]
at java.lang.Class.forName(Class.java:274) ~[?:1.7.0_76]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:170) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
... 12 more
Caused by: java.lang.IllegalArgumentException
at org.objectweb.asm.ClassReader.<init>(Unknown Source) ~[asm-all-4.1.jar:4.1]
at org.objectweb.asm.ClassReader.<init>(Unknown Source) ~[asm-all-4.1.jar:4.1]
at org.objectweb.asm.ClassReader.<init>(Unknown Source) ~[asm-all-4.1.jar:4.1]
at net.md_5.specialsource.RemapperProcessor.process(RemapperProcessor.java:83) ~[RemapperProcessor.class]
at org.bukkit.plugin.java.PluginClassLoader.remappedFindClass(PluginClassLoader.java:403) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:368) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:192) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_76]
at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_76]
at java.lang.Class.forName0(Native Method) ~[?:1.7.0_76]
at java.lang.Class.forName(Class.java:274) ~[?:1.7.0_76]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:170) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
... 12 more
[13:15:06] [Server thread/ERROR]: Could not load 'plugins/RoleplayCards.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException Cannot find main class `Cards'
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:172) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:145) ~[JavaPluginLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:314) ~[SimplePluginManager.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:236) [SimplePluginManager.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugins(CraftServer.java:299) [CraftServer.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at net.minecraft.world.storage.SaveHandler.initBukkitData(SaveHandler.java:438) [axc.class]
at net.minecraft.world.storage.SaveHandler.func_75757_d(SaveHandler.java:136) [axc.class]
at net.minecraft.world.World.<init>(World.java:353) [afn.class]
at net.minecraft.world.WorldServer.<init>(WorldServer.java:152) [mj.class]
at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:345) [MinecraftServer.class]
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:310) [lj.class]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:599) [MinecraftServer.class]
at java.lang.Thread.run(Thread.java:745) [?:1.7.0_76]
Caused by: java.lang.ClassNotFoundException Failed to remap class Cards
at org.bukkit.plugin.java.PluginClassLoader.remappedFindClass(PluginClassLoader.java:447) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:368) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:192) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_76]
at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_76]
at java.lang.Class.forName0(Native Method) ~[?:1.7.0_76]
at java.lang.Class.forName(Class.java:274) ~[?:1.7.0_76]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:170) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
... 12 more
Caused by: java.lang.IllegalArgumentException
at org.objectweb.asm.ClassReader.<init>(Unknown Source) ~[asm-all-4.1.jar:4.1]
at org.objectweb.asm.ClassReader.<init>(Unknown Source) ~[asm-all-4.1.jar:4.1]
at org.objectweb.asm.ClassReader.<init>(Unknown Source) ~[asm-all-4.1.jar:4.1]
at net.md_5.specialsource.RemapperProcessor.process(RemapperProcessor.java:83) ~[RemapperProcessor.class]
at org.bukkit.plugin.java.PluginClassLoader.remappedFindClass(PluginClassLoader.java:403) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:368) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:192) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_76]
at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_76]
at java.lang.Class.forName0(Native Method) ~[?:1.7.0_76]
at java.lang.Class.forName(Class.java:274) ~[?:1.7.0_76]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:170) ~[PluginClassLoader.class:git-Cauldron-MCPC-Plus-1.7.2-1.1147.04.196]
... 12 more