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That is the crux of the problem. You need to debug your code and find out why the length is not a multiple of 8. Place a bunch of print statements throughout your code to find out exactly what data...

Isn't the exception obvious? Your input must have a length which is a multiple of 8. The input you are passing in is not a multiple of 8. So find out why and rectify that.

I have no idea what you are trying to do, what your problem is or where it is occuring. Any chance you can provide more information?