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Here is the code at the top of the 404 page:
Warning: array_unique() expects parameter 1 to be array, string given in /home/owcpanel/public_html/wp-includes/post-template.php on line 682
Warning: join(): Invalid arguments passed in /home/owcpanel/public_html/wp-includes/post-template.php on line 499
I’ve tried re-uploading the wp-includes folder from a fresh install of wordpress but no luck. The biggest issue is not being able to save the home page.