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First of all, switch off the tab. Then check if the SD card is properly seated by removing and inserting it. Switch on the tab and check under Settings -> Storage if the option to unmount the SD card is enabled, but don't tap it. The way to the SD card properties may be slightly different on your tab. Then check if there is sufficient free space left. If this doesn't solve the problem, a master reset may be necessary. Just remember to backup contacts and calendar before doing a master reset! Contacts can be exported to a file on SD card. Applications from phone storage can be reinstalled from Google Play, under your "My Apps" menu.