Installing Drupal 7 Openpublic distribution profile error is encountered:
Notice: Array to string conversion in _menu_router_build() (line 3619 of C:\wamp\www\openpublic\includes\menu.inc)
Fix: In the file \openpublic\includes\menu.inc, find and change below line (around line 36xx)
from: array_multisort($sort, SORT_NUMERIC, $menu, SORT_STRING);
to: array_multisort($sort, SORT_NUMERIC, $menu, SORT_ASC);
Be sure to make a backup of the file first, or uncomment original line by adding // before the line.
This may also be applicable for a specific, similar error:
Notice: Array to string conversion in menu_link_save() (line 3155 of /var/www/xxx/xxx/html/includes/menu.inc)
Another suggestion found elsewhere is to downgrade PHP5.4 to 5.3 if that is the case. Adding additional PHP version in WampServer is easy, for switching back and forth across versions.