Lil'Wayne

my r4 card has just stopped working..help please?

when I switch on my ds lite with my r4 card in it the loading screen comes up but in very small writing across the screen it says ’system date error! Please check NDS system date.’

Can anyone help me out with this. Going on hol next Sunday and really wanted to be able to take the card.

This happened to my card and then about a week later my cousin told me that she was getting the same message on her DS.

Thanks
did a search on the net and after trying advice given, my card is working again. All I needed to do was put the date back a couple of months.