Unable to feed.extract slashdot.com feed about feeder HOT 3 CLOSED

> feed.extract("http://rss.slashdot.org/Slashdot/slashdot")$items[, "title", drop = FALSE]
                                                                           title
1  A New Attack Allows Intercepting Or Blocking Of Every LTE Phone Call And Text
2                     Fedora 25 Beta Linux Distro Now Available For Raspberry Pi
3                          US Police Consider Flying Drones Armed With Stun Guns
4            More NFL Players Attack Microsoft's $400M Surface Deal With The NFL
5                                  Who Should We Blame For Friday's DDOS Attack?
6   Photographer Glimpses Larry Page's Flying Car Hovering In California (Maybe)
7           'Picat' Programming Language Creators Surprised With A $10,000 Prize
8               Researchers Predict Next-Gen Batteries Will Last 10 Times Longer
9           AT&T Buys Time Warner For $85B. Is The Mass Media Consolidating?
10                              "Splat" of Schiaparelli Mars Lander Likely Found
11          A British Supercomputer Can Predict Winter Weather a Year In Advance
12                                  Amazon May Handle 30% Of All US Retail Sales
13             VeraCrypt Security Audit Reveals Many Flaws, Some Already Patched
14                American 'Vigilante Hacker' Defaces Russian Ministry's Website
15                                Dyn Executive Responds To Friday's DDOS Attack