After: php-cli bin/magento setup:upgrade
Anyone an idea?
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This issue raised due to Theme
As per as,your shared picture, you have
installed Codazon Fastest/Any Codazon theme at your system.
This theme must have any issue and issue arise as Magento does not validated that theme
Magento\Framework\View\Design\Theme\Validator method _
May be any theme of codazon does not define theme name
Or May be you have an issue in composer.json of theme or Codazon module
See magento some details at https://github.com/magento/magento2/issues/840
Few steps to solve your above problem:-
1.) Check your:
app/design/frontend/Vendor/yourtheme/theme.xml and check if it has got
<title></title> tag has got a value and it is not empty
2.) Clear your
generated/ folder and run your
3.) Check if your database has entry for that particular theme or not.
Not sure if this will help someone, but in my case, the problem was I had inherited a slightly mangled database and there was a record in the theme table that had a theme with no title. Deleted that record to resolve the problem.
DELETE FROM theme WHERE title IS NULL;
... or something along those lines.