E250R problem

Hello, I have a Sansa E250R and it has worked brilliantly since I got it.  However, recently when I add tracks on to it and then go and listen to them some of the tracks will show up as “unknown” on the sansa.  When I select these files they just skip right over and go to the next song.  When I plug into the computer and go into the music folder it shows the songs as being there but when I actually look on the sansa it merely shows up as “unknown” and wont let me play them


Bad ID3 tags.

Thanks a lot!  It always ends up being something silly and simple :smileyvery-happy: