For example, I want to do this trip (all nonstops flight among different cities)

1. 6/24 ORD-LAX
2. 6/28 LAX-EWR
3. 6/30 EWR-MCO
4. 7/4 MCO-STL
ANA website showed "This service is not available for the specified itinerary. Please amend the flight criteria and try again."
So, does anybody know I violated which rule? Thank you!