I create a test application in S60 3rd edition. now i can't install the applicaion in N80 device. This is my first application that i try to install in device. i made sis,scr and key file by using "createsis create test.pkg" command. then try to install the sis file in N80 device and facing a error "certificate not valid yet....." what should i need to do now? please any body can help me.