When I open the category page on the admin and when I try to edit category I got the below error:

Fatal error: Method Magento\Ui\TemplateEngine\Xhtml\Result::__toString() must not throw an exception, caught Error: Cannot use string offset as an array in /vendor/magento/module-ui/Component/Wrapper/UiComponent.php on line 0

Do you have any idea how we can solve it!

Your answers are appreciated


  • here is the solution which you faced the problem, might be helpful to you
    – Hitesh
    Commented Oct 3, 2018 at 12:52
  • Hi @Hit's I am not using the custom module I have an issue on the category section when I click on it.
    – Rajan Soni
    Commented Oct 3, 2018 at 13:11

1 Answer 1


Just remove the generated folder.

In the magento root directory run this

rm -rf generated/*

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