Ok, I am not expert when it comes to the simulator so it's hard for me to tell you exactly where to check, but in order to just fix the situation: 1. Uninstall everything (Nokia Qt SDK that is) 2. Download the latest release if you don't have it 3. Install to default location "c:\nokiaqtsdk", and make sure you select the proper stuff on the installation. 4. Create mobile application project and tests again, should work. What OS are you using?