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I am having an issue with some errors appearing when I try to click on the 'Configuration' tab, once I have logged into as an administrator.

When I click configuration I get all sorts of errors, such as below.

If I close the errors down and reopen, the errors are not there. I have opened some of the php files and it seems to be something to do with 'language'

I have inherited this site from another developer, who is not getting the errors.

Does anybody have any sort of idea?

Many thanks

Notice: Trying to get property of non-object in menu_tree_page_data() (line 1235 of /Users/Marshall/Sites/acquia-drupal/includes/menu.inc).
Notice: Trying to get property of non-object in _menu_build_tree() (line 1387 of /Users/Marshall/Sites/acquia-drupal/includes/menu.inc).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Undefined index: #id in abbvie_hs_menu_tree__main_menu() (line 138 of /Users/Marshall/Sites/acquia-drupal/sites/hs-hcp.abbvie/themes/abbvie_hs/template.php).
Notice: Trying to get property of non-object in _node_types_build() (line 707 of /Users/Marshall/Sites/acquia-drupal/modules/node/node.module).
Notice: Trying to get property of non-object in entity_get_info() (line 7787 of /Users/Marshall/Sites/acquia-drupal/includes/common.inc).
Notice: Trying to get property of non-object in entity_get_info() (line 7787 of /Users/Marshall/Sites/acquia-drupal/includes/common.inc).
Notice: Trying to get property of non-object in _node_types_build() (line 707 of /Users/Marshall/Sites/acquia-drupal/modules/node/node.module).
Notice: Trying to get property of non-object in _node_types_build() (line 707 of /Users/Marshall/Sites/acquia-drupal/modules/node/node.module).
Notice: Trying to get property of non-object in entity_get_info() (line 7787 of /Users/Marshall/Sites/acquia-drupal/includes/common.inc).
Notice: Trying to get property of non-object in entity_get_info() (line 7787 of /Users/Marshall/Sites/acquia-drupal/includes/common.inc).
Notice: Trying to get property of non-object in entity_get_info() (line 7787 of /Users/Marshall/Sites/acquia-drupal/includes/common.inc).