Error: Maximun Number of Songs Exceeded

I was uploading albums to the card from my laptop hard drive and went over the maximum space. The the files are mp3. I deleted the album that put me over the top. Now, I erased all the albums except one and still see this error. Then, I deleted everything from the microsd card and the formatted it. I then uploaded one album to the card and am seeing this error again. Any ideas why the phone will not read the card properly at this point? Thanks!

Edit: I was able to put a single file onto the card and have it read by "Music". When I put an entire folder (album) containing only mp3 files is when i seem to encounter this problem. I used to be able to put folders on to the card without any issue.

The problem only occurred when attempting again to put the folders that I initially tried to put on the card. I successfully put folders containing mp3s onto the card later. I do not use Sprint Media for this process. I just drag and drop between the folders.