Db Artist Sansa C150 Says "no Space For Db" And Will Not Work?

Sansa c150 says "no space for db" and will not work? - db artist

Whenever I turn on my SanDisk Sansa C150 says there is "no space for DB Please delete more than 4 WBO." and when I click the settings it says I am 54 thousand songs. but when I connect to my computer it says no files, no songs and no images in it. When I click on the music of artists in my Sansa, the screen freezes and I have to remove the battery. I have no software and Elso everything that came with it. When I had my laptop bag was stolen. PLEASE HELP !!!!!!!!!!!!