Eclipse wont run my RMI program?

[Ben Flowers]

Hi,
Im writing an RMI based chat program and its working fine when i compile it by the command line with javac and rmic.
However when ive put it into eclipse im getting the followign errors and i cant tell why:

java.rmi.ServerException: RemoteException occurred in server thread; nested exception is: 
	java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: 
	java.lang.ClassNotFoundException: RMIServer
	at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:413)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:267)
	at sun.rmi.transport.Transport$1.run(Transport.java:177)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:636)
	at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:273)
	at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:251)
	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:377)
	at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
	at java.rmi.Naming.rebind(Naming.java:177)
	at RMIServerImpl.main(RMIServerImpl.java:68)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: 
	java.lang.ClassNotFoundException: RMIServer
	at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
	at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:403)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:267)
	at sun.rmi.transport.Transport$1.run(Transport.java:177)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:636)
Caused by: java.lang.ClassNotFoundException: RMIServer
	at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:334)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at sun.rmi.server.LoaderHandler.loadProxyInterfaces(LoaderHandler.java:728)
	at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:672)
	at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:609)
	at java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:646)
	at java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:311)
	at sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStream.java:255)
	at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1548)
	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1510)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1749)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
	... 12 more

i have tried it in packages and allunder the default package. I have also generated the stubs etc.. int he bin folder to see if that would work...
But nothing.
Do i need to configure something in eclipse?
Thanks,
Ben