I am trying to implement the ticketing application with a Nokia 6131 NFC phone. This application comes with Nokia 6131 NFC SDK. I also have a reader from Arygon. However, When I load the application on the phone I get java.lang.SecurityException and java.lang.NullPointerException errors. These errors are not seen in the emulator though. The forum suggests me to buy a certificate from the Certificate authority and sign my application with that certificate to get rid of the error. Is there anything else that I need to do in order to make this application work successfully. Any sort of support will really help me.