Thanks for the detailed information. I believe you're getting this error message because the plugin can't find the Java executable.
Did you follow the instructions at the bottom of the very first post about adding a path to the Java executable to the Windows PATH environment variable and do you see the version number, if you enter
java -version in a command prompt window?
If not, this might be the cause of the problem, because the plugin assumes that the java executable can be found via PATH (or other environment variables).
(I've added the path to the PATH environment variable and have no problems running the epubcheck plugin via Calibre.)
Quote:
Originally Posted by DNSB
Result: Flightcrew works either way, epubcheck works from Sigil when launched from command line but does not work when using the Open With plugin to launch.
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FlightCrew will always work, because because the FlightCrew binary is in a pre-defined, known location, while the Java binary might be in any number of directories.
Maybe a Calibre plugin developer could develop a Calibre epubcheck plugin for you?