Error when trying to Run 'Hello World' application (on Mac)

[swannvichot]

I tried following the step by step video tutorial: https://www.youtube.com/watch?v=xDLpgCWIfug&list=UU-WZeGkrA6D9zbPjv3Cexfg
everything goes well but then I try to Run the application and I get this error:

@thboileau Let me know if you need more screenshots or details.