Problems Running DS Roms

I have recently downloaded 3 different Nintendo DS roms and a number of different pokemon roms for Nintendo DS.
I have atleast two different files for each ROM and am having trouble getting any of them to run.
When i try to run any of the ROM's on NO$GBA (suited for DS) i get a message saying;"The data could not be read.
Please turn off the power then,
remove and reinsert the DS Game Card."And when i try to load any of them on the other emulators (DeSmuME & IDeaS) nothing appears. I am left with a black screen on both.Any advice on what i might be doing wrong would be appreciated.Thanks

Make sure you have no$gba v2.6a, you can get it this site here

Thanks for your help, however.I downloaded the latest version of no$gba and i am still getting the same problem.
I also downloaded a few other ROM's and am still having the same problem.I attatched an image of the problem i have.Thanks for any info.

Under emulation settings, what is your setting for "NDS - Cartridge Backup Media" ?

I am sorry.
I just realised i clicked on the v2.6 not v2.6a link.
I downloaded the new one. A little strange, not even the homepage for the emulator or any other site that i visited had the link for this version.
It is working fine now.Thank you for your help!Nathan.

2.6a is a modifcation of 2.6 that adds the Auto setting for saved files. This solved a bunch of problems with loading errors.