Too many parameters for command 'open

Hello, I am getting "Too many parameters for command 'open'." error when trying to connect to a server for below command,

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option confirm off
open sftp://uname:pwd@abc.example.com/ -hostkey="ssh-rsa 1024 xx:xx:xx:xx:xx" -timeout=60 -rawsettings SendBuf=0 SshSimple=1 -rawtransfersettings IgnorePermErrors=0 PreserveTimeDirs=0
=======================================================================================

I have checked lot of other posts mentioning the use of Double-Quotes for text having space and I think my above script is complaint with that.
If I remove the last set of parameters followed by "-rawtransfersettings" my script work fine. That is the "open sftp://uname:pwd@abc.example.com/ -hostkey="ssh-rsa 1024 xx:xx:xx:xx:xx" -timeout=60 -rawsettings SendBuf=0 SshSimple=1" commands works perfectly.

I am not sure how to proceed further with this as I am new to command scripting world.

Regards,
Naresh

Your duplicate (and answered) post on Stack Overflow:
https://stackoverflow.com/q/55696465/850848