Grad Credit - ettSummer2018

Fatal error: Uncaught Error: Call to a member function getPossibleValuesType() on null in /nfs/c08/h02/mnt/172784/domains/ettsummer.org/html/wp-content/plugins/wpdatatables/source/class.wpdatatable.php:829 Stack trace: #0 /nfs/c08/h02/mnt/172784/domains/ettsummer.org/html/wp-content/plugins/wpdatatables/source/class.wpdatatable.php(969): WPDataTable->createColumnsFromArr(Array, Array, Array) #1 /nfs/c08/h02/mnt/172784/domains/ettsummer.org/html/wp-content/plugins/wpdatatables/source/class.wpdatatable.php(2451): WPDataTable->arrayBasedConstruct(Array, Array) #2 /nfs/c08/h02/mnt/172784/domains/ettsummer.org/html/wp-content/plugins/wpdatatables/controllers/wdt_functions.php(422): WPDataTable->fillFromData(Object(stdClass), Array) #3 /nfs/c08/h02/mnt/172784/domains/ettsummer.org/html/wp-includes/shortcodes.php(319): wdtWpDataTableShortcodeHandler(Array, '', 'wpdatatable') #4 [internal function]: do_shortcode_tag(Array) #5 /nfs/c08/h02/mnt/172784/domains/ettsummer.org/html/wp-includes/shortcodes.php(197): preg_replace_callback in /nfs/c08/h02/mnt/172784/domains/ettsummer.org/html/wp-content/plugins/wpdatatables/source/class.wpdatatable.php on line 829