6133 ringtone

Trying to get a .aac file to play as a ringtone on Nokia 6133 but it says,

"cannot be set as a ringing tone"

Anybody have a solution for this.

There are other .aac files on the phone that work, just not the ones I've uploaded.

Used the nokia software to convert and upload the files to the phone.

Thanks

try reconverting the file, sounds like the coding didn't convert right.