Error code 7

Some of my games won't load because when i try to load it, it says "Error Code 7 Please Reset System"
can anyone help me solve this problem???

Take a look in the Common Issues thread.
https://www.romulation.org/forum/index.php?topic=1462.0And for future reference, read the How to Ask for Help thread as well.
https://www.romulation.org/forum/index.php?topic=1736.0

Where do i get the ARM7 patch?

The ARM7 file comes from a ROM that you know works on your card, and you use the programs available in that thread to extract the file from the game and put it in the game that doesn't work. By doing that hopefully the game that doesn't work will now work.

Make sure you have the latest firmware for your flashcart. http://www.linfoxdomain.com/ds/

how do I know which one is the ARM7 file?
Also, the product I'm using is the TTDS.
Oh yeah, I do have the latest firmware for the TTDS from linfoxdomain.com

Read the Common Issues on ARM7 patching https://www.romulation.org/forum/index.php?topic=1462.0 The file will be named 'arm7.bin'. Hard to miss.

Its not there

The Arm7.bin file is not in the Common Issues thread, it is in the extracted files when you use DSLazy to extract the ROM.

The Common Issues covers ARM7 patching is what I mean.

Oh.