Python pyperclip module: ArgumentError

I'm trying to do some work on Python with the text that I store on the clipboard. I'm using the pyperclip module. I install the module in the cmd with pip as usual:

pip install pyperclip

And seems to work fine because when I import the module import pyperclip it runs without any problem. But when I try to run any piece of code using it, even the example of usage given in the documentation:

pyperclip.copy('The text to be copied to the clipboard.')
pyperclip.paste()

I get an ArgumentError:

ArgumentError: argument 1: <class 'TypeError'>: wrong type

I'm a noob in Python which may be one of the reasons I'm clueless on how to solve this.