Playing Audio Files in Android Logs Strange Error -

i using method play sounds in assets

public void playsound(string sound_name) {     try {          if (mplayer != null) {             if (mplayer.isplaying()) {                 mplayer.stop();             }             mplayer.release();         }         mplayer = new mediaplayer();          int timersoundid;         string packagename = getpackagename();         timersoundid = getresources().getidentifier( sound_name , "raw" , packagename );           assetfiledescriptor descriptor = getresources().openrawresourcefd(timersoundid);         mplayer.setdatasource(descriptor.getfiledescriptor(), descriptor.getstartoffset(), descriptor.getlength());         descriptor.close();          mplayer.prepare();         mplayer.setvolume(1f, 1f);         mplayer.start();      } catch (exception e) {     } } 

while test application on device, whenever sound played error printed

07-19 11:21:55.715    1833-6093/? e/audiopolicyservice: getoutput() tid 6093 ++ 07-19 11:21:55.715    1833-6093/? e/audiopolicyservice: getoutput() tid 6093 -- 07-19 11:21:55.715    1833-6093/? e/audiopolicyservice: getoutput() tid 6093 ++ 07-19 11:21:55.715    1833-6093/? e/audiopolicyservice: getoutput() tid 6093 -- 07-19 11:21:55.715    1833-6093/? e/audiopolicyservice: getoutput() tid 6093 ++ 07-19 11:21:55.715    1833-6093/? e/audiopolicyservice: getoutput() tid 6093 -- 07-19 11:21:55.715    1833-6093/? e/audiopolicyservice: getoutput() tid 6093 ++ 07-19 11:21:55.715    1833-6093/? e/audiopolicyservice: getoutput() tid 6093 -- 07-19 11:21:55.715    1833-6093/? e/audiopolicymanagerbase: unknown stream type 07-19 11:21:55.715    1833-6093/? e/audiopolicymanagerbase: unknown stream type 07-19 11:21:55.715    1833-6093/? e/audiopolicymanagerbase: unknown stream type 07-19 11:21:55.715    1833-6093/? e/audiopolicymanagerbase: unknown stream type 07-19 11:21:55.715    1833-6093/? e/audiopolicymanagerbase: unknown stream type 07-19 11:21:55.715    1833-6093/? e/audiopolicymanagerbase: unknown stream type 07-19 11:21:55.715    1833-6093/? e/audiopolicymanagerbase: unknown stream type 07-19 11:21:55.715    1833-6093/? e/audiopolicymanagerbase: unknown stream type 07-19 11:21:55.715    1833-6093/? e/audiopolicymanagerbase: unknown stream type 07-19 11:21:55.715    1833-6093/? e/audiopolicymanagerbase: unknown stream type 

app not crash , not detect problem. thought reason format of audio files. wav. changed them mp3, still no difference. music plays leaves these log lines behind it.

do have worry it? or ignore it? suggestion appreciated...