No, I don't get any error message.

In configuration of web push-

1.Choose Integration - Typical site

2.Site setup - 

Site name - publicapp

SIte url - publicapp.in ( I was entered with https )

Site logo - {I was uploaded my logo}

3.Permission prompt setup - Slide prompt

Everything good. For permission prompting slide but I have not get yet any push notification. I got many notification mails.