E102 - Two slides at same grid position

Cause

Two slides have the same position: [x, y]. The deck is a 2D grid; each cell can hold at most one slide.

Example

{ slides: [
  { id: "a", position: [0, 0], source: "a.slide.json" },
  { id: "b", position: [0, 0], source: "b.slide.json" }
]}

How to fix

Move one of the slides to a different (x, y) coordinate.