Welcome to Android Central! Which device? Does it have an SD card? This error often occurs due to a corrupt media file saved somewhere on the device. If you have an SD card, try unmounting it (in Settings>Storage), then removing it. Does the error go away? If so, then insert the card into your computer. Can the computer read these files? Backup as much as you can right now, then run chkdsk to look for bad sectors: http://forums.androidcentral.com/am...guide-using-chkdsk-fix-corrupted-sd-card.html.