getwvkeys.py crashes on startup

[TopSkillGamer]

Hi,

I recently asked here how to download some widevine mpeg-dash streams.
I was very kindly helped and it worked flawlessly, until now.
It now crashed on startup and shows some errors for a few frames before it closes.

I believe I added the pssh, license url and headers correctly.
The only needed header is the so called "x-custom-data", which contains your ip-address and checks if it is the same as where the request is coming from.
I used mobile data so I can freely share it.

It's not about me wanting to download this exact video per se, I would really like to know how to resolve this in the future.

PSSH: AAAAXHBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAADwIARIQct ut/Jq5CS091144BwhDuRoIdXNwLWNlbmMiGGN0dXQvSnE1Q1MwOTE xNDRCd2hEdVE9PSoAMgA=
LICENSE URL: https://npo-drm-gateway.samgcloud.nepworldwide.nl/authentication
HEADERS:
"x-custom-data": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJu cG8iLCJpYXQiOjE2NDc3NzY1OTIsImRybV90eXBlIjoid2lkZX ZpbmUiLCJsaWNlbnNlX3Byb2ZpbGUiOiJ3ZWIiLCJjbGllbnRf aXAiOiIxMDkuMzguMTQ5LjExMCJ9.VNeoRq8d3xNb13OTLJQyM e5uRicNqD6BJ7EW8mThl1Y"
(Dutch geo-locked) video page: https://www.npostart.nl/het-sinterklaasjournaal/05-12-2020/VPWON_1325233
The error I'm getting:

[Attachment 63905 - Click to enlarge]

Thanks in advance!

[lomero]

72dbadfc9ab9092d3dd75e38070843b9:9c0f059d35187f75c077620ccfa555c9

[TopSkillGamer]

Thanks, I really appreciate it, but could you tell me how you managed to get this key? I would really like to download more videos as well.
Did you use getwvkeys.py?

Thanks!