Some talks have a speaker that is not in the speaker list about cfp-devoxx HOT 2 CLOSED

  [org.optaconf.bridge.devoxx.DevoxxImporter] (default task-1) Ignoring speaking relation for speaker (Charles Nutter) to talk (Doing Open Source (The Right Way)) because the speaker doesn't exist in the speaker list.
  [org.optaconf.bridge.devoxx.DevoxxImporter] (default task-1) Ignoring speaking relation for speaker (Charles Nutter) to talk (JRuby 9000) because the speaker doesn't exist in the speaker list.
  [org.optaconf.bridge.devoxx.DevoxxImporter] (default task-1) Ignoring speaking relation for speaker (Vinicius Senger) to talk (Providing Eyes, Ears, and a Mouth to Your IoT Project) because the speaker doesn't exist in the speaker list.
  [org.optaconf.bridge.devoxx.DevoxxImporter] (default task-1) Ignoring speaking relation for speaker (Yara Senger) to talk (Providing Eyes, Ears, and a Mouth to Your IoT Project) because the speaker doesn't exist in the speaker list.
  [org.optaconf.bridge.devoxx.DevoxxImporter] (default task-1) Ignoring speaking relation for speaker (Eugenio Marletti) to talk (Hinting around: Android text demystified) because the speaker doesn't exist in the speaker list.
  [org.optaconf.bridge.devoxx.DevoxxImporter] (default task-1) Ignoring speaking relation for speaker (Rene Gielen) to talk (MVC 1.0 - by Example) because the speaker doesn't exist in the speaker list.
  [org.optaconf.bridge.devoxx.DevoxxImporter] (default task-1) Ignoring speaking relation for speaker (Maurice Naftalin) to talk (Shooting the Rapids: Maximizing the Performance of Java 8 Streams) because the speaker doesn't exist in the speaker list.
  [org.optaconf.bridge.devoxx.DevoxxImporter] (default task-1) Ignoring speaking relation for speaker (Aslak Knutsen) to talk (The Borg is docking your system; testing is futile! Or is it?) because the speaker doesn't exist in the speaker list.
  [org.optaconf.bridge.devoxx.DevoxxImporter] (default task-1) Ignoring speaking relation for speaker (Mohamed Taman) to talk (The First IoT JSR: Units of Measurement ) because the speaker doesn't exist in the speaker list.
  [org.optaconf.bridge.devoxx.DevoxxImporter] (default task-1) Ignoring speaking relation for speaker (Otávio Santana) to talk (The First IoT JSR: Units of Measurement ) because the speaker doesn't exist in the speaker list.
  [org.optaconf.bridge.devoxx.DevoxxImporter] (default task-1) Ignoring speaking relation for speaker (Xavier Tordoir) to talk (Towards a rebirth of Data Science) because the speaker doesn't exist in the speaker list.
  [org.optaconf.bridge.devoxx.DevoxxImporter] (default task-1) Ignoring speaking relation for speaker (Clement Escoffier) to talk (vert.x 3 - be reactive on the JVM but not only in Java) because the speaker doesn't exist in the speaker list.