Home page Error: Unfortunately an error has occurred

"I made my first store and it displays 'Error: Unfortunately an error has occurred.' on the home page."

To function correctly, the site must have:
  1. At least one product
  2. The product must have a price engine assigned to it
  3. There must be at least one Shipping Method turned on at the store level
  4. There must be at least one Payment Method turned on at the store level
If any one or more of these are missing, the error will display.