The list is missing. I get a «Not Found» both in the categories Kanji and Words.
Thank you in advande!
I think there is a misunderstanding here, because important_rad is not a kanji or words list. It's just a tag that's added to the most important radicals in the radicals page list: https://www.japandict.com/radicals
Thank you! I misunderstood it as a list because it was searchable.
Yutaka you are right. I didn't notice that this was a link in the radical detail page. It should be not and I'll fix it.
Thank you for reporting.