I'm trying to upload a file to a sftp server from an Android App using JSCH v. 0.1.55. However, I get an exception during the connection.

com.jcraft.jsch.JSchException: java.lang.InstantiationException: java.lang.Class<com.jcraft.jsch.UserAuthNone> has no zero argument constructor
    at com.jcraft.jsch.Session.connect(Session.java:393)
    at com.jcraft.jsch.Session.connect(Session.java:183)
Caused by: java.lang.InstantiationException: java.lang.Class<com.jcraft.jsch.UserAuthNone> has no zero argument constructor
    at java.lang.Class.newInstance(Native Method)
    at com.jcraft.jsch.Session.connect(Session.java:390)

This error seems to happen when the password is not set, but I checked with the debugger and all info are correct. Also, I can conect using FileZilla. Here is the code. The error is when executing session.connect();

Session session = null;
Channel channel = null;
try {
    JSch jsch = new JSch();
    session = jsch.getSession(user, host, port);
    session.setPassword(password);

    Properties config = new Properties();
    config.put("StrictHostKeyChecking", "no");
    config.put("PreferredAuthentications", "password");
    session.setConfig(config);

    session.connect();

    // Code uploading the file

} catch (Exception ex) {
    ex.printStackTrace();
}