Periodic calculations in Gaussian03



Dera all,
 Has anyone ever done periodic calculations in gaussian03? I've tried to perfrom
 periodic calculation for even a simpler sytem like NaH but everytime I get an
 error message. The reason for my preference of gaussian03 is to take advantage
 of the variety of packages it offers especially in analysing bond overlap
 population like NPA and MPA.
 Regards,
 Ojwang'