Email Listener plugin throws exception on IMAP connection

I just install openfire 3.7 with email listener plugin.
When i test imap email listener, status failed.
this log found.

at javax.net.ssl.DefaultSSLSocketFactory.throwException(SSLSocketFactory.java:179)

at javax.net.ssl.DefaultSSLSocketFactory.createSocket(SSLSocketFactory.java:186)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:225)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189)
at com.sun.mail.iap.Protocol.<init>(Protocol.java:107)
at com.sun.mail.imap.protocol.IMAPProtocol.<init>(IMAPProtocol.java:104)
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:538)
... 47 more
Caused by: java.lang.ClassNotFoundException: org.jivesoftware.util.SimpleSSLSocketFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at javax.net.ssl.SSLSocketFactory.getDefault(SSLSocketFactory.java:85)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:225)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189)
at com.sun.mail.iap.Protocol.<init>(Protocol.java:107)
at com.sun.mail.imap.protocol.IMAPProtocol.<init>(IMAPProtocol.java:104)
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:538)
at javax.mail.Service.connect(Service.java:288)
at javax.mail.Service.connect(Service.java:169)
at org.jivesoftware.openfire.plugin.emailListener.EmailListener.openFolder(EmailLi stener.java:288)
at org.jivesoftware.openfire.plugin.emailListener.EmailListener.access$100(EmailLi stener.java:45)
at org.jivesoftware.openfire.plugin.emailListener.EmailListener$1.run(EmailListene r.java:96)

Another observation:
Using Wireshark I watched the imap connection and noticed this when my Email Listener test failed:

• BAD Protocol Error: "Command received without terminating <CR><LF> sequence".\r\n