Error message

• Warning: Undefined variable $node in include() (line 44 of /home2/zenitjtk/public_html/sites/corporategiftsfactory/themes/professional_theme/templates/page.tpl.php).
• Warning: Attempt to read property "nid" on null in include() (line 44 of /home2/zenitjtk/public_html/sites/corporategiftsfactory/themes/professional_theme/templates/page.tpl.php).
• Deprecated function: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in views_page_title_pattern_alter() (line 40 of /home2/zenitjtk/public_html/sites/all/modules/page_title/modules/views.page_title.inc).
• User warning: The following module is missing from the file system: uc_volume_pricing. For information about how to fix this, see the documentation page. in _drupal_trigger_error_with_delayed_logging() (line 1181 of /home2/zenitjtk/public_html/includes/bootstrap.inc).
• Warning: Undefined array key "field_product_category_tid" in eval() (line 1 of /home2/zenitjtk/public_html/sites/all/modules/views/plugins/views_plugin_argument_default_php.inc(66) : eval()'d code).