I have tried to install skt-welding and indestrial themes. Both install fine but when you try to import their sample data you get the following errors: Menu item skipped due to invalid menu slug: primary
my wordpress version is WordPress 4.9.6
Menu skipped because no primary or footer menu might have been created. Kindly go to appearance>menus and create menu and then you will find a checkbox which says set up as primary menu or set up as footer menu.
Check the box and save the menu and it should appear just fine.
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