It looks like that field must be of type "number" and be limited to one value like you see in the image above. The "number of values" fieldset should be on the content type's manage fields page, e.g. "admin/structure/types/manage/<content-type>/fields/<field-of-type-mailchimp-subscription>".
I would check the manage field page to make sure it is set to one for the number of values allowed.
Hello,
Thank you for your response !
We followed the steps of the documentation,
so we copied the content and the themes on backdrop en then we went to the page domain/core/...
Does the Administrator role of your site have the permission "Access administration bar"? (I think, you wouldn't notice the missing permission if your own account is the so called User 1.)
Posted1 day 5 hours ago by Olaf Grabienski (Olafski) on:
Hi @allinappli and welcome! Just for clarity, did you already run the site updates portion of the upgrade to Backdrop? (e.g. at /core/update.php)
Do you have command line access or...
Comments
The specific error you are seeing comes from https://github.com/backdrop-contrib/mailchimp/blob/1b970f66c112e88d2ccfe....
It looks like that field must be of type "number" and be limited to one value like you see in the image above. The "number of values" fieldset should be on the content type's manage fields page, e.g. "admin/structure/types/manage/<content-type>/fields/<field-of-type-mailchimp-subscription>".
I would check the manage field page to make sure it is set to one for the number of values allowed.