Can someone help me to solve this, I tried to create a new class, something came out and said "It seems that this project has not been built yet, do you want to build it now? " i had make sure that i did as what the tutorial taught

Answer 1

Always build projects before you run them. A build compiles the code you write into language that the computer can understand and run. Building is also the process which catches out any errors that you may have made in your code!

Answer 2

guarantees a run