dropbox api - javascript:- Read Excel sheet from drop box -

i getting these characters: - http://screencast.com/t/km9ajzuy8fhi

success: function(files) {                 client.readfile(files[0].name,function(error, contents,s) {                     if (error) {                         return showerror(error);  // went wrong.                     }                     console.log(contents);                 });             }, 

i dont know doing wrong