Created Unassigned: Message type 120 is not valid [1908]

Hello,

I got following error in the session connect.

"Message type 120 is not valid"

Renci.SshNet.dll!Renci.SshNet.Session.LoadMessage(byte[] data) Line 1539
Renci.SshNet.dll!Renci.SshNet.Session.ReceiveMessage() Line 884 + 0xb bytes
Renci.SshNet.dll!Renci.SshNet.Session.MessageListener() Line 1585 + 0x8 bytes
Renci.SshNet.dll!Renci.SshNet.Session.Connect.AnonymousMethod__4() Line 529 + 0x8 bytes
Renci.SshNet.dll!Renci.SshNet.Session.ExecuteThread.AnonymousMethod__3d(object o) Line 25 + 0xf bytes

Server is at sftp.wrightimg.com. Here is the server info obtained from WinSCP

Session protocol = SSH-2
SSH implementation = WeOnlyDo-wodFTPD 3.1.3.348
Encryption algorithm = aes
Compression = No
File transfer protocol = SFTP-4

I appreciate your help.

Thanks,
-Tony