Starcraft 2 Preparing Game Data Exclusive [best] Online

The part of the error is the key. It indicates that your game client is attempting to gain exclusive read/write access to a specific set of game data files (usually found in the Caches or Shaders folders). However, something is blocking that access.

Sometimes, the "exclusive" lock fails due to a network handshake timeout with Blizzard’s servers. starcraft 2 preparing game data exclusive