Passes in Workspace. Fails in Challenge.

My code below will work in my workspace and I get the exact result the challenge is looking for. I copy and paste the code into the Challenge and I get the follow:

Bummer! System.ArgumentNullException: Value cannot be null. Parameter name: String. See output for stack trace.

System.ArgumentNullException: Value cannot be null. Parameter name: String at System.Number.StringToNumber (System.String str, System.Globalization.NumberStyles options, System.Number+NumberBuffer& number, System.Globalization.NumberFormatInfo info, System.Boolean parseDecimal) [0x00054] in /builddir/build/BUILD/mono-4.8.0/mcs/class/referencesource/mscorlib/system/number.cs:1074 at System.Number.ParseInt32 (System.String s, System.Globalization.NumberStyles style, System.Globalization.NumberFormatInfo info) [0x00014] in /builddir/build/BUILD/mono-4.8.0/mcs/class/referencesource/mscorlib/system/number.cs:745 at System.Int32.Parse (System.String s) [0x00000] in /builddir/build/BUILD/mono-4.8.0/mcs/class/referencesource/mscorlib/system/int32.cs:120 at Treehouse.CodeChallenges.Program.Main () [0x0001f] in <473f1640fac745dd9a752ffb5b9fd241>:0 at MonoTester.Run () [0x00095] in MonoTester.cs:86 at MonoTester.Main (System.String[] args) [0x00013] in MonoTester.cs:28

What am I missing here??

using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {

          try
          {


            //This will end up being the running total of how many times I say the word
            double wordTotal = 0.0;


            while (true)
            {
              string theWord = "Yay!";


              //Prompt user to enter number of "Yay"
              Console.Write("Enter the number of times to print \"Yay!\": ");
              int numYay = Int32.Parse(Console.ReadLine());



              //Prints the string "Yay" to the screen that number of times the user entered
              for(int repeatYay = 0; repeatYay < numYay; repeatYay++)
              {
                Console.WriteLine(theWord);
              }

              //Need a way to get out of the program
              if(numYay == 0)
              {
                break;
              }




              int timesEntered = numYay;



              //Keep track of how many times the we have entered "Yay"

              wordTotal += timesEntered;

             Console.WriteLine(wordTotal);continue;


            }

        }
        catch(FormatException)
        {
          Console.WriteLine("That is not valid input");
        }


    }
  }
}