Compilation error, but after that it runs correctly

Question

Hi, I'm starting to code a very basic series of excercises in Java and C#, and now I have a problem with this C# code https://code.sololearn.com/c2DD7i7d4Beo
At first it says compilation error, but after running again, the code works.
Can anybody throw some light over my issue? Is there any syntax error that I could have mistaken with Java?
Thanks in advance!

Answer 1

It ran fine here by me. No complilation error.

Answer 2

for me also working

Answer 3

Thanks!