OpenCart website 404 fault

problems
1- i have been customizing the open cart theme layout 3 in my website and suddenly i have 404 page not found from the home page . that is theme layout out 3 home page showing 404 page not found . when i change the layout to any other layout it works well

2 - am having a this notice on the website.
Warning: implode(): Invalid arguments passed in /home/bongaloc/public_html/catalog/controller/extension/module/so_deals.php on line 162Warning: Division by zero in /home/bongaloc/public_html/catalog/controller/extension/module/so_listing_tabs.php on line 596