Error of Application Close Main! During Start Up

Error of App Close Main! During Start Up:You can fix the app close main error..1) Open 3rd Party Application like x-plore, Fexplorer.2) Go to c:/system/bootdata & delete 'FirstBoot.dat'.3) Turn off phone & take out your MMC card.4) Turn on phone and put in current time/date.5) Wait for it to boot up then turn off phone again.6) Put MMC back in and turn on phone.