Will not play purchased yahoo music

Question

Sansa e260r will not play purchased music. It will play inported music from CD's, but when I transfer purchased yahoo music and attempt to play, the message pops up in the sansa player "syncronize to continue your music subscription" What I have done:1. syncronized all music2. confirmed music subscription is current "yahoo to go"3. reformatted Sansa e260rNeed help!