No template will load

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Non of the installed templates will load any more.
Getting the message here under.
Anybody know how to rectify this


Argument 1 passed to Concrete\Core\Page\Type\Type::getPageTypePageTemplateDefaultPageObject() must be an instance of Concrete\Core\Page\Template, null given, called in /home/martare/domains/studiomartare.nl/public_html/concrete/src/Page/Page.php on line 1626 and defined

Kind regards

Niels

NLS61