My Banshee Media Player has encountered a problem

Hi guys,
My Banshee Media Player has encountered a problem. I received an error message while opening an mp3 file with Banshee Media Player. It requires an additional plugin. Have you any idea for the Advanced Streaming Format (ASF) demuxer? Please help.
Thanks in advance.

Banshee Media Player requires an additional plugin to decode this file
The following plugin is required:
Advanced Streaming Format (ASF) demuxer
Do you want to search for this now?
