PL/SQL to Web Services Error

I am getting the error shown below when I call out to my web service. The odd thing is it only happens intermittently. For example, the call happens every 5 minutes so on the first call it fails but then the next one it works. Any ideas?
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

I forgot to precise that the error occurs when executing : exec dbms_output.put_line(time_service.get_local_time('94065'));

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