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I want to Encrypt my tablet and while doing so,my encryption is 100% 
completed and the tablet re-starts and a message is displayed on 
tablet saying "Encryption unsuccessful" 

=========================================================================== 
Encryption was interrupted and cant complete.As a result,the data on 
your tablet is no longer accessible. 

  To resume using your tablet,you must perform a factory reset.When 
you setup your tablet after reset,you'll have an opportunity to 
restore any data that was backed up to your google account.Then I had 
to reset the tablet to get it working. 
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 and I am forced to reset Tablet. 

Here is some logs : 

logcat before reboot: 
 V/CryptKeeper( 1632): Encryption progress: 100 

logcat after reboot: 
W/SystemServer(  178): Device encrypted - only parsing core apps 
... 
 I/ActivityManager(  178): START 
{act=android.intent.action.MAIN cat=[android.intent.category.HOME] 
flg=0x10000000 cmp=com.android.settings/.CryptKeeper} from pid 0 
I/ActivityManager(  178): Start proc 
com.android.settings for activity com.android.settings/.CryptKeeper: 
pid=299 uid=1000 gids={1015, 3002, 3001, 3003} 
... 
D/CryptKeeper(  299): Validating encryption state. 
D/VoldCmdListener(  101): cryptfs cryptocomplete 
E/Cryptfs (  101): Cannot open footer file /dev/block/platform/omap/omap_hsmmc.1/by-name/crypto 
E/Cryptfs (  101): Error getting crypt footer and key 
... 
W/CryptKeeper(  299): Incomplete, or corrupted encryption detected. Prompting user to wipe. 

Any pointer on this.Thank you very much.