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This is regarding an System Related error in my Sony Ericsson Walkman series phone. I purchase this handset two month back (JUNE'12) and got my handset updated to Android 4.0.4 ICS from that same Sony Ericsson Retailer on that same day. Other details regarding the error are :
Phone Model : WT19i LIVE WITH WALKMAN.
Error Message : Cannot play track.
Operating System : Android 4.0.4 (ICS).
Details: Due to absence of inbuilt file manager in my phone I downloaded "ES File Explorer File Manager" from Google Play.
All the audio files were in the "bluetooth" folder in my SD card and I moved (Deleting the source files) those files from that folder
to an existing folder named "music" in same memory card.
After this operation whenever i try to play the audio files from my Walkman app it shows the above mentioned error.I again
moved (Deleting the source files) those files back to bluetooth folder from music folder and then the above error didn't came.
Don't know whats wrong..!!!!!
Guys please help me what to do about this problem..
just do update media in walkman player....
as you move the files...one to another location
SonofGalaxy: Will You Pleasse Tell me how to update media..???
I searched every where in the options but could'nt find any thing like that..!!!! 
sure !
go on :