Generating a SSL certificate for Websocket Serevr

I don't know if I generated the certificate wrongly or if I'm doing something wrong but I seem to keep getting a error:

EIdOSSLLoadingRootCertError: Could not load root certificate.

error:0B084002:x509 certificate routines:X509_load_cert_crl_file:system lib

I can't remember the command I used to generate the certificate as it was something from online and I can't find it anymore.

After generating the certificate I'm trying to load it as follows:

 wsServer.SSLOptions.CertFile := '.\ssl.pem';

  wsServer.SSLOptions.KeyFile := '.\ssl.pem';

  wsServer.SSLOptions.RootCertFile := '.\ssl.pem';

  wsServer.SSLOptions.Version := tls1_2;

  wsServer.SSLOptions.OpenSSL_Options.APIVersion := oslAPI_1_1;

  wsServer.Port := 1001;

  wsServer.SSLOptions.Port := 1002;

  wsServer.SSL := True;

  wsServer.Active := True;

How do i correctly Generate a certificate and then load it with the sgcWebsocketServer?