add to playlist not working

i am using drupal 6 and audio module unstable 5.
when i click on add to playlist i gets error messages:
"warning: Illegal offset type in isset or empty in C:\wamp\www\trans\includes\bootstrap.inc on line 873.
warning: Illegal offset type in C:\wamp\www\trans\includes\bootstrap.inc on line 874.
warning: Illegal offset type in C:\wamp\www\trans\includes\bootstrap.inc on line 878."
can anybody know how to resolve it?
or anybody know the alternative of audio module for create an audio playlist?
i have also try dash player module but it also not working...