I am trying to convert multiple Wikipedia pages to a single PDF using Prince 12 on Windows 10.
This is my first time with Prince.
I added the URLs of the relevant Wikipedia pages, checked Merge and clicked on Convert, but I got a variety of parse and unsupported properties warning messages.
Clearly I'm missing some steps.
Any help would be appreciated.

Was the output PDF produced, or did conversion fail entirely?

No output.

What is the error message? Normally HTML input will be parsed even with errors, it is only XML or XHTML input that must be well-formed in order to be fully processed.

Since there is no log I attach a screenshot.
I have to correct what I said before. There was an output file (I was looking in Downloads, not Documents) but it will take some time to see if there are any problems with it.
One question: is there any automatic switch that will rotate pages where a table is too wide for the portrait-oriented page (as in this instance)?

1. Screenshot.png‎ 484.0 kB

There is no automatic landscape switch, this requires applying a specific named page to the tables in question.