You get a fatal crash after the launch of Watch Dogs 2, while it tries to connect to your data.
That means that you have probably got a big issue previously with a black screen and you had to shutdown or to restart your computer.
Therefore the game was unabled to well close the save files that are now corrupted.
Your save files located in Documents > Watch Dogs 2 > Saves or Uplay > UID > 1.save and 2.save are no longer working.
You have to start the game from the beginning.
I suggest your to quit the game and make a backup of them after each big mission in Watch Dogs 2.