in my windows phone 8 application i am using custom uri association to launch another application through my phone.

```
i.e

await Windows.System.Launcher.LaunchUriAsync(new Uri("sixtag:"));

```

but my app is not able to get certified for store because of this. the testing team tells that you app terminates unexpectedly while executing this. 
now, i don't know how to deal with this. 
is there any way to throw exception if the app which i am launching is not installed on phone ? 
or i should try something else so my task gets accomplished and app gets certified for store as well.