invalid installation package

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http://qt-project.org – Hi I have made an app for the N9 in Qt creator (Qt 4.8), it works great when i run it on the device from the creator, but whenever I try to install the package I get an error saying “Can’t install. Invalid installation package”. Can anyone tell me what’s wrong with the package, or how I can find out what’s wrong with it ? The package can be downloaded here : https://openrepos.net/content/kif/osmapper. I have other projects where the installation package works fine, so it should not be the Qt environment that’s at fault. Kim (HowTos)