No DISPLAY and Error Trying to access array offset on value of type null

I have some problem with youtubechannel module
The site is on Drupal core 9.5.10
After installing and enabling /youtubechannel:^3.4, I have the error :
Warning: Trying to access array offset on value of type null in youtubechannelvideo() (line 76 of modules/contrib/youtubechannel/youtubechannel.module).
I don't know if this causes the non-access by menu "admin/config/services/" where does not appear "Youtubechannel Settings."
Whatever I go with the address "admin/config/services/youtubechannel"
and I enter the good parameters "Youtube Google API Key", "Youtube Channel ID" etc.
But when I put Youtube Channel in a Block and when displaying the page, nothing appears but the text "Please configure this section in the admin page"
Can you help me please.
Thank you