Hi,
I have not possibility to modify my experience.
When I click on "Save" , the message "Saving Error" appears (see Attachment).
When I click on "Publish", the message "Publishing error" appears. (see Attachment)
When you click on an experience's element, in the "Content" tab, "Loading" appears but nothing is loaded. (see Attachment)
I created this experience locally with Developer Edition.
I tried to copy the "config.json" file from the experience to another PC (with ArcGIS Experience Developer Edition), but the problem is the same.