Device 0 (VID=054c and PID=0327) is a Sony Walkman NWZ-S615F/NWZ-S616F/NWZ-S618F.
PTP_ERROR_IO: Trying again after re-initializing USB interface
object 4 has parent 0xffffffff (-1) continuing anyway
object 5 has parent 0xffffffff (-1) continuing anyway
object 6 has parent 0xffffffff (-1) continuing anyway
object 7 has parent 0xffffffff (-1) continuing anyway
object 8 has parent 0xffffffff (-1) continuing anyway
object 9 has parent 0xffffffff (-1) continuing anyway
MTP extended association type 0x00000001 encountered
MTP extended association type 0x00000001 encountered
MTP extended association type 0x00000001 encountered
MTP extended association type 0x00000001 encountered
MTP extended association type 0x00000001 encountered
MTP extended association type 0x00000001 encountered
Device have files in "root folder" 0xffffffffU - this is a firmware bug (but continuing)
[5 Warn  11:25:57.128] Failed to load media-player-info file for 
[5 Warn  11:25:57.128] Failed to load media-player-info file for 
[5 Debug 11:25:57.214] Found DAP support (Banshee.Dap.Mtp.MtpSource) for device WALKMAN and Uuid /devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.2/2-1.2.3/2-1.2.3:1.0/host7/target7:0:0/7:0:0:0/block/sdf
[1 Debug 11:25:57.215] Unmapping DAP source (/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.2/2-1.2.3/2-1.2.3:1.0/host7/target7:0:0/7:0:0:0/block/sdf)
[6 Warn  11:25:58.235] Caught an exception - System.ObjectDisposedException: The object was used after being disposed. (in `mscorlib')
  at System.Runtime.InteropServices.SafeHandle.DangerousAddRef (System.Boolean& success) [0x00000] 
  at (wrapper managed-to-native) Mtp.Album:LIBMTP_Get_Album_List (Mtp.MtpDeviceHandle)
  at Mtp.Album.GetAlbums (Mtp.MtpDevice device) [0x00000] 
  at Mtp.MtpDevice.GetAlbums () [0x00000] 
  at Banshee.Dap.Mtp.MtpSource.LoadFromDevice () [0x00000] 
[1 Warn  11:25:58.265] Caught an exception - System.NullReferenceException: Object reference not set to an instance of an object (in `Banshee.Dap')
  at Banshee.Dap.Gui.DapInfoBar.UpdateUsage () [0x00000] 
  at Banshee.Dap.Gui.DapInfoBar.<OnSourceUpdated>m__4 () [0x00000] 
[1 Warn  11:25:58.265] Caught an exception - System.NullReferenceException: Object reference not set to an instance of an object (in `Banshee.Dap')
  at Banshee.Dap.Gui.DapInfoBar.UpdateUsage () [0x00000] 
  at Banshee.Dap.Gui.DapInfoBar.<OnSourceUpdated>m__4 () [0x00000] 
[1 Warn  11:25:58.265] Caught an exception - System.NullReferenceException: Object reference not set to an instance of an object (in `Banshee.Dap')
  at Banshee.Dap.Gui.DapInfoBar.UpdateUsage () [0x00000] 
  at Banshee.Dap.Gui.DapInfoBar.<OnSourceUpdated>m__4 () [0x00000] 
[1 Warn  11:25:58.265] Caught an exception - System.NullReferenceException: Object reference not set to an instance of an object (in `Banshee.Dap')
  at Banshee.Dap.Gui.DapInfoBar.UpdateUsage () [0x00000] 
  at Banshee.Dap.Gui.DapInfoBar.<OnSourceUpdated>m__4 () [0x00000] 
[1 Warn  11:25:58.265] Caught an exception - System.NullReferenceException: Object reference not set to an instance of an object (in `Banshee.Dap')
  at Banshee.Dap.Gui.DapInfoBar.UpdateUsage () [0x00000] 
  at Banshee.Dap.Gui.DapInfoBar.<OnSourceUpdated>m__4 () [0x00000] 
[1 Warn  11:25:58.265] Caught an exception - System.NullReferenceException: Object reference not set to an instance of an object (in `Banshee.Dap')
  at Banshee.Dap.Gui.DapInfoBar.UpdateUsage () [0x00000] 
  at Banshee.Dap.Gui.DapInfoBar.<OnSourceUpdated>m__4 () [0x00000] 
[1 Warn  11:25:58.265] Caught an exception - System.NullReferenceException: Object reference not set to an instance of an object (in `Banshee.Dap')
  at Banshee.Dap.Gui.DapInfoBar.UpdateUsage () [0x00000] 
  at Banshee.Dap.Gui.DapInfoBar.<OnSourceUpdated>m__4 () [0x00000] 
[1 Warn  11:25:58.265] Caught an exception - System.NullReferenceException: Object reference not set to an instance of an object (in `Banshee.Dap')
  at Banshee.Dap.Gui.DapInfoBar.UpdateUsage () [0x00000] 
  at Banshee.Dap.Gui.DapInfoBar.<OnSourceUpdated>m__4 () [0x00000] 
[1 Warn  11:25:58.265] Caught an exception - System.NullReferenceException: Object reference not set to an instance of an object (in `Banshee.Dap')
  at Banshee.Dap.Gui.DapInfoBar.UpdateUsage () [0x00000] 
  at Banshee.Dap.Gui.DapInfoBar.<OnSourceUpdated>m__4 () [0x00000]