RSS Aggregator generates error in html-validator

Hi,
Thank You for the great work with RSS Aggregator!

Testing my site with html-validator I got a error:

Error: Attribute start not allowed on element ul at this point.
From line 7, column 61242; to line 8, column 11
-page="1"><ul class="wpra-item-list rss-aggregator "↩ start="1"><li cl

Is there a possibility to correct this?

Thank You in advance

The page I need help with: [log in to see the link]