Self Signed Certificate Issue using -cacert flag

I am passing the self signed certificate generated by my localhost(IIS Express) using the flag -cacert but its giving the error as says
**Failed to create TLS config: failed to append ca certs** can anyone help me out what is the proper way of using the -cacert flag and which certificate need to be passed.

Thanks In advance

Start with the -cacert flag handling and the TLS configuration path that reports “failed to append ca certs.” Reproduce the IIS Express self-signed certificate case, determine which certificate format and trust chain the flag accepts, and document or correct the behavior so the command succeeds with the proper certificate.

Written by the indexing model from the issue text.