2000 Mazda MPV key light flashing

Hi there, I have 2000 Mazda MPV and I put the main computer and the emobelizer and after all instruction I have all acc and dashboard light are working perfectly the turns but the enging won’t start and with egnition on at the bottom right corner of the dash one light flashing it has the key sign on it and the enging won’t start. Any way to get start it please and thenk you.