Ah ok so the nokia projects compass is an example Qt Quick app...

I don't have the apps but most probably both of them have put the same package name hence the issue...

You can therefore only have 1 of them installed at a time...My advice would be to contact the developer of the Store app and ask him to modify his package name slightly to differentiate his app...

Alternatively, since the source for the nokia projects' compass is available from the same site why not download source and pack it with a slightly different package name...