"Did you alter the original EatFly method instead of creating a new one?" No I didn't. I deleted it all and wrote it.

You get that message because you are not meant to touch the original method at all in any way. And removing it entirely certainly counts as touching it.

For challenges it's generally a bad idea to do anything not explicitly asked for in the instructions, and the instructions says nothing about removing the method. That means you have to add the original method back in order to complete the challenge.

There is another issue with your code though, which is that the instructions told you to create a method that took distanceToFly and flyReactionTime as parameters. You have defined the parameters in the opposite order, which will create an issue since the order of the parameters determine what arguments gets assigned to what parameter.

I would also add that your if statement is actually pretty redundant, the expression you have written will result in true or false on its own and can be returned directly.

Here is the solution to the exercise:

namespace Treehouse.CodeChallenges
{
    class Frog
    {
        public readonly int TongueLength;
        public readonly int ReactionTime;

        public Frog(int tongueLength, int reactionTime)
        {
            TongueLength = tongueLength;
            ReactionTime = reactionTime;
        }

        public bool EatFly(int distanceToFly)
        {
            return TongueLength >= distanceToFly;
        }
        public bool EatFly(int distanceToFly, int flyReactionTime)
        {
          return ReactionTime <= flyReactionTime && TongueLength >= distanceToFly;
        }

    }
}