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As you can see below the admin interface just doesn't have any Buttons. I already tried clearing the static folder and switching in the app/etc/di.xml

“Magento\Framework\App\View\Asset\MaterializationStrategy\Symlink” to “Magento\Framework\App\View\Asset\MaterializationStrategy\Copy”

And doing a new static content deploy command. I also cleared every possible cache and used a new admin user created via command line.

I did change in vendor/magento/module-thema/MOdel/Theme/Collection.php the following code:

On line 240 I added $parentPathPieces && into the if statement because I was facing an error that parentPathPieces doesn't implement the countable interface. Without that fix the Admin Page wont load at all and throw me an error.

a:4:{i:0;s:217:"Warning: count(): Parameter must be an array or an object that implements Countable in /is/htdocs/wp11252460_O42WGWXYKG/preview.scharnebeckermuehle.de/vendor/magento/module-theme/Model/Theme/Collection.php on line 240";i:1;s:4304:"#0 [internal function]: Magento\Framework\App\ErrorHandler->handler(2, 'count(): Parame...', '/is/htdocs/wp11...', 240, Array)

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