remoting annoying Exception {"Found two different objects associated with the same U

[C# Programming]

Hello

Help me Please!!

the problem occur when :
first i run my chat program and it's working well , but when i get out of my program
at log back in im getting this error at the server When he try to invoke me some event:
{"Found two different objects associated with the same URI, '/999013af_72e3_42b1_affa_43766d7f541f/Chat'."}

i just dont know what to do :S

here is the client side app.config























and this is the instance im running from client

RemotingConfiguration.Configure("c:\\Hafaka\\IskaMessengerUser.exe.config", false);
RemotableObejct RemoteObject = (RemotableObejct)Activator.GetObject(typeof(RemotableObejct), "http://xxxxxxxxxx:7717/Chat");