The first message is most likely displayed because there are other syntax errors in the .opf file. Simply open and save it with Calibre Editor or Sigil to fix it.
Quote:
Originally Posted by johnarthurnichol
RSC-005 (ERROR) Message: Error while parsing file 'The entity name must immediately follow the '&' in the entity reference.'.
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This message is displayed, if you use a stand-alone ampersand instead of an ampersand entity. E.g.
<p>a
& b</b>
instead of
<p>a
& b</b>