"There is no pluggin installed to handle a MP3 file" on Rhithmbox

["grimbys@ya.com " <grimbys@ya.com>]

Hi, when I want import a carpet with MP3 files on my rhithmbox
0.8.7(Debian Sid), it sais me "There is no pluggin installed
to handle a MP3 file" on every mp3 file.

I searched about how handle mp3 file, but I can't find
solution, I have installed, every package I thought
(gstreamer-plugin, libid3tag0 ...)

Can you help me? Thanks you!