Issue: SFTP via Mainframe using BPXBATCH

Hi,

I am trying to execute sftp transfer via the bpxbatch utility.
I am getting an exit status of 16. Any idea what this means ?
I have searched almost everywhere but couldn't find the mention of status 16.
Below is the log:
debug1: Next authentication method: publickey.
debug1: Offering public key: /u/users/CDFTPGC/.ssh/id_dsa.
debug1: Server accepts key: pkalg ssh-dss blen 433.
debug1: read PEM private key done: type DSA.
debug1: Authentication succeeded (publickey)..
debug1: channel 0: new .client-session..
debug1: Entering interactive session..
debug1: Sending subsystem: sftp.
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0.
debug1: channel 0: free: client-session, nchannels 1.
debug1: fd 0 clearing O_NONBLOCK.
debug1: fd 1 clearing O_NONBLOCK.
debug1: fd 2 clearing O_NONBLOCK.
debug1: Transferred: stdin 0, stdout 0, stderr 0 bytes in 0.4 seconds.
debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 0.0.
debug1: Exit status 16.