Pokemon Diamond Issue

When i try to load the Pokemon Diamond Rom with no$gba it says "The data could not be read. Please turn off the power, then remove and reinsert the DS Game Card."
I tried restarting the emulator but that didnt work.

Try the latest version of no$gba, 2.6a I think and/or messing around with your emulation settings to get it to work.

more info, please? what could cause this?

https://www.romulation.org/forum/index.php/topic,567.0.htmlThe search button is very useful. Don't underestimate its almighty power.