Without either code or data, it's really hard for us to reproduce your problem or to suggest what might be the (root) cause, other than data that decodes to invalid Unicode sequences. My random guess is that you are either fiddling with the UTF-8 flag on strings or are creating Unicode strings in another invalid way, but that's hard to tell without code or data.
My suggestion to you is to reduce your input data to find the line(s) which are causing the warnings to be thrown. In a second step, reduce the code of your program until nothing else remains except a short sequence of statements that are causing the warnings to be thrown.
If by then, the solution is not obvious to you, show us both, the data and the short program. Maybe then we can help you better.
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