Problem (Objective Storyline) • [Element] • the underlying cause of the story’s difficulties • Of all the Elements, there is a single one that describes the essence of the story’s problem. The inclusion of this element in an Objective Character identifies him as the Main or Obstacle Character. This is because it makes that character the only one who can solve both the Objective and Subjective problems in a single stroke by addressing the problem (changing).
From the Dramatica Dictionary