ymsg exception problem

Last two catch statement produce two error message...what is the problem ??

Code :

---

package ymsg.network;
 
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.lang.Throwable;
 
 
 
 
public class Main
{
 
 
    public static void main(String[] args)
    {
 
        {
            Session ss = new Session();
            try
            {
                ss.login("username", "password");
            }
 
            catch (IllegalStateException ex)
            {
                Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
            }
            catch (IOException ex)
            {
                Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
            }
            catch (AccountLockedException ex)
            {
                 Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
            }
            catch (LoginRefusedException ex)
            {
                Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
            }
 
 
 
 
 
        }
 
     }
}

---

error_1:
incompatible types
found :ymsg.network.AccountLockedException
required :java.lang.throwable


error_2:
incompatible types
found :ymsg.network.LoginRefusedException
required :java.lang.throwable