getting INVALID KEYCODE msg while loading vb.net project

Dear all

I created Crystal Report embedded in VB.Net ignoring Register with CR

but after few days i entered registration number n keycode for crystal report in vb.net after that whenever i open vb.net project containg Crystal Rpt it could not be loaded only flasing error msg "Invalid Keycode".

please help me how can i fix this problem to open Crystal Rpt already created but this rpt. is opend in Crystal Report without vb.net

thanks in advance for any help