WinForms and Web Service (.NET 4.6.2)

Hi, I just want to ask your expert opinion regarding this weird scenario I am experiencing right now. For an overview of my app, basically I just created an app that calls a web service. The webservice will return "Hello World".

Whenever I run the program in debug mode, I'm having this error

Attachment 166557

However, whenever I execute the compiled EXE file, the program works well.

Attachment 166559

I am wondering and really puzzled right now why I'm having that error whenever I run the program in debug mode.

Please enlighten me.

Thanks