Product Details PCamPPS

Fatal error: Uncaught TypeError: Argument 1 passed to DOMXPath::__construct() must be an instance of DOMDocument, boolean given in C:\inetpub\sites\pcam.com\wp-content\themes\salient\functions.php:6446 Stack trace: #0 C:\inetpub\sites\pcam.com\wp-content\themes\salient\functions.php(6446): DOMXPath->__construct(false) #1 C:\inetpub\sites\pcam.com\wp-content\themes\salient\functions.php(6207): query_mssql_layout_product_details(Array, 7, 'product-details') #2 C:\inetpub\sites\pcam.com\wp-content\themes\salient\functions.php(6110): query_mssql_execute('SELECT T...', Array) #3 C:\inetpub\sites\pcam.com\wp-includes\class-wp-hook.php(288): pre_query_mssql_execute('', 'sc', Array) #4 C:\inetpub\sites\pcam.com\wp-includes\plugin.php(208): WP_Hook->apply_filters('', Array) #5 C:\inetpub\sites\pcam.com\wp-includes\shortcodes.php(337): apply_filters('do_shortcode_ta...', '', 'sc', Array, Array) #6 [internal function]: do_shortcode_tag(Array) #7 C:\inetpub\sites\pcam.com\wp-includes\shortcodes.php(199): preg_replace_callback( in C:\inetpub\sites\pcam.com\wp-content\themes\salient\functions.php on line 6446