There is too much water or not enough flour. This is easy to fix. Add 1 tablespoon of flour to the batter and stir well with a whisk. Lift the whisk from the batter and let it drizzle onto the surface. If it forms a ribbon on the surface it is the right consistency. Continue adding flour until you reach this consistency. If the batter it too thick just add one tablespoon of water check the consistency the same way.