Error reading source directory: 421 No-transfer-time exceeded. Closing control connection

The following command works "lsd:
'''
rclone lsd -vv --config=tmp.conf data-dir:
'''

2021/02/08 03:18:09 DEBUG : rclone: Version "v1.51.0" starting with parameters ["rclone" "lsd" "-vv" "--config=tmp.conf" "data-dir:"]
2021/02/08 03:18:09 DEBUG : Using config file from "/tmp.conf"
2021/02/08 03:18:10 DEBUG : sftp://xx@ftp.yy.com:22/: New connection ip:port->ip2:port2 to "SSH-2.0-WS_FTP-SSH_7.6.3"
-1 2021-02-04 22:41:12 -1 History
2021/02/08 03:18:11 DEBUG : 12 go routines active
2021/02/08 03:18:11 DEBUG : rclone: Version "v1.51.0" finishing with parameters ["rclone" "lsd" "-vv" "--config=tmp.conf" "data-dir:"]

The copy command also fails with "stat failed: sftp: "Folder not found:"

In short ,
ls fails
lsd succeeds
copy fails

I looked at Sftp SSH_FX_FAILURE directory not found and tried with rclone v1.52.3 bit same behaviour.

Please suggest