Getting error_code 5 for some tracks.

Hi Paul, Thanks for the reply. Yes it worked. The problem was in URL encoding in artist name.

I got another weird problem. Here is URL -

http://developer.echonest.com/api/v4/playlist/dynamic/create?api_key=TAFYO7QHYKWQE791F&artist=KK,Pritam,Shefali%20Alvares,Yo%20Yo%20Honey%20Singh&song_id=spotify-WW:track:0PSALeWN6XzdEtNEDl8BD5&bucket=id:spotify-WW&limit=true&type=artist-radio

If i shuffle artist names, it works properly. but the sequence mentioned above returns - { status = { code = 5; message = "The Identifier specified does not exist"; version = "4.2"; }; }

and yeah now the response is same on both device and browser. Can you please help me out. How can sequence of Artist_Name affects response. If so then what would be the ideal sequence. I am damn sure i m missing something. Thanks in advance. :)