There are 2 methods to solve this problem.

1.1 Change the Date in DS.

    1.1.1 Take out the NDS cards and start up DS without them

    1.1.2 Tap the symbol in the middle of the screen at the bottom that looks like a DS.

    1.1.3 Tap the blue box with a calender and clock in.

    1.1.4 Change the date a month or two back.

    1.1.5 Restart DS with NDS cards in.

    1.1.6 Done!

1.2 Update R4 Firmware.

    1.2.1 Go to http://www.r4i-sdhc.com/downloade.asp

    1.2.2 Unrar the file and extract to memory card's root directory.

•         go to www.download.com to download "winrar" software.
•         install winrar.exe into your computer. (after you install the software, you can see the book icon for all *.rar file)

•         double left click the file. and Extract To your computer.

•      Copy all the file in the folder and put into memory card.

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•   DONE