我嘗試在我的電子郵件中打開文件夾，但沒有運氣。這是錯誤：Mar 06, 2019 1:24:14 PM Export runSEVERE: A3 BAD User is authenticated but not connected.javax.mail.MessagingException: A3 BAD User is authenticated but not connected.;  nested exception is:    com.sun.mail.iap.BadCommandException: A3 BAD User is authenticated but not connected.    at com.sun.mail.imap.IMAPFolder.open(IMAPFolder.java:960)    at Export.getEmails(Export.java:115)    at Export.run(Export.java:72)    at Main.main(Main.java:5)Caused by: com.sun.mail.iap.BadCommandException: A3 BAD User is authenticated but not connected.    at com.sun.mail.iap.Protocol.handleResult(Protocol.java:338)    at com.sun.mail.imap.protocol.IMAPProtocol.select(IMAPProtocol.java:656)    at com.sun.mail.imap.IMAPFolder.open(IMAPFolder.java:926)    ... 3 more這就是我嘗試過的：public void getEmails() throws MessagingException, IOException {    Session session = Session.getInstance(props);    session.setDebug(DEBUG);    store = null;    store = session.getStore("imap");    store.connect("imap-mail.outlook.com", this.userName, this.password);    folder = store.getFolder(FOLDER_NAME);    folder.open(Folder.READ_ONLY);    int total_messages = folder.getMessageCount();    if(total_messages > 0) {        messages = folder.getMessages();    }}是道具：props = new Properties();        props.setProperty("mail.store.protocol", "imap");props.setProperty("mail.imap.ssl.enable", "true");  props.setProperty("mail.imap.starttls.enable", "true");    props.setProperty("mail.imap.host", "imap-mail.outlook.com");props.setProperty("mail.imap.port", "993");   用戶名和密碼都可以。我試圖更改密碼，但我在驗證時遇到了另一個錯誤，因此密碼和用戶名是正確的。我檢查了 store.isConnected，我得到了真實的結果。行中的問題：folder.open(Folder.READ_ONLY);可能是什么問題？