I have some of the same errors. is there an update for this plugin for WP 3.5? It says current with new WP version, but I am getting a lot of errors as well..
Your Css selectors are wrong. Find suitable selectors
@vencat4india: are you kidding me? This is right after install. I don’t have ANY selectors entered yet. Obviously the plugin is not handing defaults correctly, as to enter a value I first must clear the input from the error message and then type the selector. And even then there are still errors.
Have you tried replacing line 547 of presets.php with:
return wp_get_theme( $theme )->exists();
@kallekillen: no, because these need to be fixed by the plugin developer, otherwise my edits will be overwritten with every update.