Adobe Captivate 9 - problem publishing in HTML5 output only

Hi, in preparation for Flash end of life I've started re-publishing all my Captivate courses using HTML5 output only.  One of my courses will not play once published as HTML5 only. I've tried in SCORM Cloud as well (to rule out LMS as the problem). The course hangs and I get these parser warnings.  I cannot work out how to fix this - can anyone help please?

Parser Warnings

• The external metadata referenced at /courses/CG3GRD95DO/IncidentAwareness_V3.2_FINAL_HTML386e195c-29f9-412d-9516-b20dad4e1e9c/0\metadata.xml could not be opened. The specific exception was: org.xml.sax.SAXParseException; lineNumber: 57; columnNumber: 29; The reference to entity "NZ" must end with the ';' delimiter.. [4001] (Manifest Level Metadata)
• The external metadata referenced at /courses/CG3GRD95DO/IncidentAwareness_V3.2_FINAL_HTML386e195c-29f9-412d-9516-b20dad4e1e9c/0\metadata.xml could not be opened. The specific exception was: org.xml.sax.SAXParseException; lineNumber: 57; columnNumber: 29; The reference to entity "NZ" must end with the ';' delimiter.. [4001] (Item 'BUP020_ORG')
• The external metadata referenced at /courses/CG3GRD95DO/IncidentAwareness_V3.2_FINAL_HTML386e195c-29f9-412d-9516-b20dad4e1e9c/0\metadata.xml could not be opened. The specific exception was: org.xml.sax.SAXParseException; lineNumber: 57; columnNumber: 29; The reference to entity "NZ" must end with the ';' delimiter.. [4001] (Resource 'BUP020_SCO_RES') (Resource 'BUP020_SCO_RES')