The Save File Could Not Be Accessed...

I have just attempted to play Lord of the Rings: Conquest on my R4DS and the message "The save data could not be accessed. Please turn the power off and reinsert the DS Card." I tried doing what it says and that did not work. This has happened to me before with sim city creator. Any ideas on what I could do?
Thanks.

Update your firmware at http://www.linfoxdomain.com/ds/.

Thanks,
I have the latest firmware but ill try it from this site and get back to you on how that goes down.

nope... unfortunately that didn't work.
I haven't been able to play any new games. I can still play the old ones I already downloaded but everything else is saying the save file can't be accessed.

It works now! I didn't notice the instructions up top for this. that patching thing really works