Using Code Generation/New Request Document Client

I generated a web service using EntireX (v821) to wrap a natural subprogram. Tested it successfully using the XML Tester. I then switched to the NaturalONE (v822) perspective and generated a New Request Document Client. Now, when I make the call to the generated subprogram, I get a NAT8304 HTTP request failed. Reason The certificate authority is invalid or incorrect.

NAT8304 HTTP request failed. Reason :1:.

TEXT:
HTTP request failed. Reason :1:.
EXPL:
The REQUEST DOCUMENT statement has received an error from the
transport layer.
ACTN:
Contact Software AG support.

Everything is running locally on a Windows XP VM Image.

What can I do to resolve this error?
Thanks, Carl

I changed the following in the generated client subprogram:
#WEB-SERVICE-END-POINT(A) DYNAMIC INIT< 'https:…”
to
#WEB-SERVICE-END-POINT(A) DYNAMIC INIT< 'http:…”

Now I get an error
NAT8312 Error during XML parser processing, reason 3.

NAT8312 Error during XML parser processing, reason :1:.

TEXT:
Error during XML parser processing, reason …
EXPL:
Possible reasons:
1: Error in parser access; XML parser not available.
2: Parser instance request failed; new instance not available.
3: Parser initialization failed.
4: XML input document is invalid.
5: Unsupported encoding is used.
6: Internal parse save-area stack overflow.
7: Resizing of parse operand failed.
ACTN:
Check the XML parser condition or XML document.