Hi,
It seems that the URL which you are passing to connect to your server is incorrect. It should be of following format:
https:///sdk
Please try passing the URL in above format and let us know if that helps.
You can refer to SDK readme document ( shipped with vSphere SDK) and some existing samples which are shipped with vSphere SDK, which uses client side utilities, to run the shipped samples.
I hope that this solves the issue at your end.
Thanks,
Angela