horizon.tv Revision 21 does not work anymore

horizon.tv stopped working with my actual settings (webgrabplus V3.1.8.0) and new settings (V5.0.1.0)

V3.1.8.0
[ Info ] ( 1/50 ) HORIZON.TV -- chan. (xmltv_id=SRF 1 HD) -- mode Force
[Error ] Unable to update channel SRF 1 HD
[Critical] Generic syntax exception:
[Critical] message:
[Error ] no index page data received from SRF 1 HD
[Error ] unable to update channel, try again later

V5.0.1.0
[ Info ] ( 1/50 ) HORIZON.TV -- chan. (xmltv_id=SRF 1 HD) -- mode Force
[Warning ] error downloading page: Response status code does not indicate success: 404 (Not Found)

Both are docker container.

Any idea how to fix it? Thank you.