I try the tSSH and I 've got this error :

Starting job ssh at 16:10 28/03/2008.
Exception in component tSSH_2
java.io.IOException: Password authentication failed.
    at ch.ethz.ssh2.auth.AuthenticationManager.authenticatePassword(AuthenticationManager.java:316)
    at ch.ethz.ssh2.Connection.authenticateWithPassword(Connection.java:311)
    at test.ssh.ssh.tSSH_2Process(ssh.java:136)
    at test.ssh.ssh.runJobInTOS(ssh.java:316)
    at test.ssh.ssh.main(ssh.java:235)
Caused by: java.io.IOException: Authentication method password not supported by the server at this stage.
    at ch.ethz.ssh2.auth.AuthenticationManager.authenticatePassword(AuthenticationManager.java:286)
    ... 4 more
Job ssh ended at 16:10 28/03/2008. [exit code=1]


Where is the problem?