Visual studio 2013 does build but do not run the solution

I'm working on my school project and hit on problem with Visual studio 2013... I created a clr project and added windows form and entry point as supposed but after building the project successfully it doesn't run it and gives me an error "system cannot find the file specified"... but when I try to run currently built .exe it works perfectly...

Any idea why the debugger cannot open the file?