Having a Problem with TWL Loader

Hi,
I want to play some Mariokart DS via TWL Loader. I started it up and launched the Game. After I launched it, a white screen appears for 2 Seconds and the 3DS boots into "Power Off Screen". It even happens on DSi Games that are on a normal card. Yes, I installed the "TWL- NAND Sided.cia" and reinstalled TWL Loader a couple of times. It happens on every DSi/DS Game.

So, how can I fix this?