This question already has an answer here:
just a newbie question to but I don't know what to do with this error.
Warning: include_once(/home/u320415047/public_html/wp-content/themes/thestore/lib/thestore-metaboxes.php): failed to open stream: No such file or directory in /home/u320415047/public_html/wp-content/themes/thestore/functions.php on line 8
Warning: include_once(): Failed opening '/home/u320415047/public_html/wp-content/themes/thestore/lib/thestore-metaboxes.php' for inclusion (include_path='.:/opt/php-5.5/pear') in /home/u320415047/public_html/wp-content/themes/thestore/functions.php on line 8
Warning: include_once(/home/u320415047/public_html/wp-content/themes/thestore/lib/custom-config.php): failed to open stream: No such file or directory in /home/u320415047/public_html/wp-content/themes/thestore/functions.php on line 9
Warning: include_once(): Failed opening '/home/u320415047/public_html/wp-content/themes/thestore/lib/custom-config.php' for inclusion (include_path='.:/opt/php-5.5/pear') in /home/u320415047/public_html/wp-content/themes/thestore/functions.php on line 9
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Looks like part of your theme got corrupted or didn't upload properly. It's telling you you're missing some files it's trying to include:
Double-check that those files are there, and if not try re-installing your theme
In wordpress when you include files in functions.php, you must reference the correct filepath, using the builtin get_template_directory() function
include( get_template_directory() .'/file.php' );