Magento 2 admin menu action result Invalid security or form key. Please refresh the page. on click

Forgive me for my question. Still new with magento 2. So I succesfully added a new admin menu. But the problem is whenever i clicked the admin menu button, I got Invalid security or form key. Please refresh the page. Here’re some of my codes. This is my menu.xml    <add id=”Testing_Basic::menu_item” title=”Manage Items” module=”Testing_Basic” sortOrder=”10″…