Coding problems have suddenly appeared

  • Quite recently a warning message began to appear at the top of my word press homepage
    Warning:join()[function.join]: Invalid arguments passed in /home/japan30/public_html/roblog/wp-includes/post-template.php on line 394 class=””>
    To begin with that was all that appeared, but at the advice of my hosting service I updated all plugins and subsequently all pages had the message at the top.
    Now, today when I checked it seems all of the pages have lost coding relating to page design. The site is at the following URL
    https://roblog.japanphotojournalist.com
    I would be very grateful for advice on how to solve this, preferably one that is stress-free and speedy!
    Thank you in advance
    RG

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  • Have you tried:

    • deactivating all plugins (yes, all) to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s). If you can’t get into your admin dashboard, try resetting the plugins folder by FTP or PhpMyAdmin (read “How to deactivate all plugins when you can’t log in to wp-admin” if you need help). Sometimes, an apparently inactive plugin can still cause problems.
    • switching to the Twenty Fourteen theme to rule out any theme-specific problems. If you can’t log in to change themes, you can remove the theme folders via FTP so the only one is twentyfourteen. That will force your site to use it.
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