Help in previewing in iOS

[WORKING NOW][edit] I closed app in simulator and started app again, it WORKED!! some how.

I developed an application using fusetools and it is previewing without any issue on Local and Android. When trying to preview the same App in iOS, I am getting attached picture issue. I have no experience with iOS. Can any one help on giving direction on what I should be looking for?

I tried running a sample app tab-bar-navigation and it worked fine in iOS. Please help.