Gaming I can't play ds pokemon games (Communication Error)

[rockset]

Note: I'm Using a r4 card to play pokemon games.
Note:My wifi always closed because there is a problem with it

When started to a new game i played a while and saved. After then when i wanted to play again i got a weird error.
Error:

A communication error has occurred.
If you were in the Union Room,
pressing the A Button will launch
DS Wireless Communications to take
you back to the Union Room. If you
press the B Button, you will be taken
to the title screen. In all other
cases, pressing the A Button will
return you to where you last saved.

When i press the A button im getting a white screen.
This happens to me in every pokemon game (HG - SS / Pearl - Diamond - Platium)
i have no problem with black&white and X/Y

Is there anyway to solve this problem?

ThankYOU.