"An erro has occurred..." when set up Gateway 3DS?

Some users met a problem when setting up Gateway 3DS, when they try to setting up, there appears a message" An error has occurred,forcing the software to close.The system will now restart.(Unsaved date maybe lost).", why does this message appears? What's wrong?
It just because users make a confusion for SD card and micro sd card. The microsd card is used for set up with the blue card and also will be used for keeping roms, but when you doing the system setting, it needs a SD card. The SD card is in the right side of your 3DS. Just pull it out, copy "Launcher.dat" file into SD card, then inert the SD card into 3DS to start system setting. Please do not use microsd card to do this step.
An error has occurred message appears when system setting as below picture

An error has occurred,forcing the software to close.The system will now restart.(Unsaved date maybe lost).

You may need a SD card, a micr sd card for setting up Gateway 3DS

Gateway 3DS