HT1338 Error preparing Time Machine backup disc- size error usually not being multiples of 512, encryption

Trying to encrypt Time Machine backup disc getting message  - Error preparing Time Machine backup disc- size error usually not being multiples of 512, encryption.

I got the same problem.
But I think it cannot be related to not being a multiple of 512.
As when I devide the number of bytes 3.000.592.982.016 by 512 is equals 5860533168.
3.000.592.982.016 / 512 = 5860533168.
So what could be the real problem?
With kind Regards

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