On April 25, 2014, Disney made the announcement that all Star Wars expanded universe works were declared "Non canon". This contradicts the Star Wars movies, including the new one, The Force Awakens. If none of the pre clone wars writing happened. Then there are many plotholes and contradictions in the Star Wars "canon" universe.
Many video games, comics, and TV shows no longer contribute to the story and are just apart of the legend stories told.
You should sign this if you want Star Wars to be whole again. The Expanded Universe, and the movies.