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Help! Problem with Encryption!

 
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I'm trying to create a key, use that to encrypt something and then use it to decrypt. I am using the example DESExample that comes with bouncy castle. It throws this exception in decrypting everytime:
org.bouncycastle.crypto.DataLengthException: last block incomplete in decryption
It happens in: org.bouncycastle.crypto.BufferedBlockCipher.doFinal(...) (or if I change to use the newer class, it still occurs in: org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher.doFinal(...) )
Does anyone know what this problem could be? The example:
 
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