Facing error message

Hi All,
I am facing the error message "Class "Concrete\Core\Page\Template" is not a valid entity or mapped super class" when I click try to edit my page,
Its a new installation. None of the module to edit the page is working. Attached is the display of the controls

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OiseauVernal replied on at Permalink Reply
Hi khanaleem,

Did you recently install or enable opcache, or another kind of PHP caching? I ask because that is how I got that error recently.