I changed the site to Single Store Mode

It then defaults to no theme

So when trying to update the theme I get:

Something went wrong while saving this configuration: Incorrect theme identification key

1 Answer 1


var/generation is not writable.

var, app/etc and pub/static should be writable by web server. Please check the below link


  • It is writable as per the permissions supplied
    – tread
    Jun 26, 2017 at 9:14

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