ePub_Checker version 3.1.2 worked fine no errors, no problems,
but with ePub_Checker version 1.5.0 gives, with the same ePub, a lot of warnings/errors I don't understand, code HTM-002 and RSC-005.
Saying that the installed xml parser doesn't supprt xml verification (code HTM-002). and DOM003 Namespace error in depth /Meta-INF/container.xml (RSC-005)
I have Jave 8 update 60
Moved to InDesign EPUB forum