fix compiling error
fix compiling error

Ninir/hallo,pazof/hallo,CodericSandbox/hallo,roryok/hallo-winrt,iacdingping/hallo,GerHobbelt/hallo,CodericSandbox/hallo,bergie/hallo,cesarmarinhorj/hallo,GerHobbelt/hallo,pazof/hallo,bergie/hallo,iacdingping/hallo,cesarmarinhorj/hallo,roryok/hallo-winrt