[KevinH]

Please try adding an existing css file to your epub just temporarily.

What is its resulting book path (mouse over the added css file in BookBrowser to see its full book path).

Try then running the plugin. The plugin should put the file right beside the existing css file you added temporarily? Did it or does the plugin still generate an error?

If so move the temporarily added css file into a "Styles" folder and try the plugin once again.

What errors does it generate?

If you have an epub that you can generate the error with, would you please post it someplace private (unless it is public domain) and pm me (KevinH) here onMobileread with a private link so that I can try to reproduce what settings are causing the plugin to write something to your root directory instead of to your epub plugin output folder.