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[hbknjr]

Somewhere in your code, list object is passed instead of a string. Try an IDE to debug.
eg-

>>> mylist = ['mystring']
>>> mylist.encode('utf-8')

You'll get-

Error:
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'list' object has no attribute 'encode'

Instead you have to pass the string contained in the list.

>>> mylist[0].encode('utf-8')  // first element of List

Output:
b'mystring'