Minimum Purchase Error

Product:Quantity:Price:Total:FE-SCANIA- 112 size - 12 1/4" Diameter x 9" Tall1$13.50$13.50FE-MTU-12V2000- MTU Size, 12" Diameter x 15 1/2" Tall Strait Cylinder Shaped1$15.00$15.00FE-24-40035. AFE 24-40035 AIR FILTER, Size, 4"Flange ID x 6" Base Diameter x 9" Tall Cone Shaped1$14.00$14.00FE-SCANIA- Scania Marine Diesel 112 Size, 12 1/4" Diameter x 9" Tall Strait Cylinder Shape1$13.50$13.50FE-Stork. Stork Wartsila WerkspoorDiesel, Size, 18" Diameter x 8" Tall Strail Cylinder Shaped1$18.00$18.00 (5) Error  Error => Minimum Purchase quantity of 6 units required for this group. (Rule ID = 541)