In my experience, if you change the encryption key, you will need to re-encrypt any previously entered passwords. In my apps, I have had to re-enter any previously saved email passwords via a page in my app.
After changing the encryption key, any strings encrypted with a different key cannot be un-encrypted.
Could it be that you update Java from 7 to 8? See stackoverflow: https://stackoverflow.com/questions/34163634/im-getting-javax-crypto-aeadbadtagexception-tag-mismatch-when-decrypting-larg
Regards,
Ronald
It worked for me, i have entered password wrongly :( Thanks for your time :)