synchronization error message

our computer recently had a melt down and we needed to get another one.  99% of the songs on the computer were downloads from Walmart.  I contacted them and they allowed me to redownload.  I did, put some on my player and keep getting the message that I need to synchronize which i did with WMP  alot of the songs i get an error message that i could not synchronize when I clicked for information it said C00D1178: Windows Media Player might not support this file type on portable devices

not sure what that means

the file types I am trying to do is mp3 and wma