DevOps, CI/CD and Automation

Database:
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Product
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production

ORA-31011: XML parsing failed ORA-19202: Error occurred in XML processing LPX-00104: Warning: element "html" is not declared in the DTD Error at line 2

Hello,
I am following the instructions in Oracle® Database Express Edition 2 Day Plus Application Express Developer Guide Release 2.1 to create a web service. The instructions are:

Application Builder --> Shared Components --> Under Logic, select Web Service References (The Web Service References page appears) --> Click Create.

When prompted whether to search a UDDI registry to find a WSDL, select Yes and click Next --> For UDDI Location, select IBM UDDI and click Next --> For Search Type, select Business Name --> In Name, enter: %xMethods%

However, when I complete the above steps, I get the following error:

ORA-31011: XML parsing failed ORA-19202: Error occurred in XML processing LPX-00104: Warning: element "html" is not declared in the DTD Error at line 2

Can you please advise as to the steps needed to troubleshoot this error - i.e. Where should I begin looking to attempt to resolve this?

Thank you very much for your help!