The output can be a bit daunting, since one small mistake can cause a cascade of errors. The trick is to look at the first error, fix that error, save the file, and run meinproc5 again.
-o, --output file
The most common way to run meinproc5 is simply as
where docbook-file is usually index.docbook. This command creates HTML pages from the DocBook file. Note that these pages are only viewable in KDE-based browsers (like Konqueror).
If you need to view the HTML output in another browser (for example, if you're placing it on line), use
meinproc5 --stylesheet stylesheet-name docbook-file
where stylesheet-name is the full path to one of the XSL stylesheets in <kdoctools_installation_prefix>/share/kf5/kdoctools/customization/. To produce output suitable for the web, you can use kde-web.xsl or kde-chunk-online.xsl. See the README file in that directory for more details.