I have installed mono and libgdiplus but I still can't seem to get sign artist to work!  Anyone able to help with this?

I feel like I am missing something

Futher examination it appears to be an SSL error.

Curl error 51: Cert verify failed: UNITYTLS_X509VERIFY_FLAG_NOT_TRUSTED

Anyone have any ideas on fixing that?

I can paste image using HTTP but not HTTPS.