Air travel – adult Ryanair marked as a child. Child marked as an adult

When making the payment of the ticket ( reservation online), where I must enter the names of the passengers, I made an error:

  • In the Child's Name field I put adult name
  • In the Adult Name field, I put a child's name.

The child is 4 years old.

Could I do some problem, cheking or the board?
Thank you!