I was building a forum section on localhost with drupal 7 core with multisite and via wampserver.
When I try to create container, I face a problem. I create a container and sub-container and I wish to order them with drag and drop style but I face two problems. I face one and delete containers and change one I face one more error like. Also when I click a container a face another. Also When I press F5 buttonmy new ly created container disapppear
error 1: after drag to reorder / the first time after i create a container
URL: http://example.com/admin/structure/forum
Site Name
Error
Notice: Undefined variable: parent in taxonomy_term_save() (line 497 of C:\wamp\www\modules\taxonomy\taxonomy.module).
PDOException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'parent' cannot be null: INSERT INTO {taxonomy_term_hierarchy} (tid, parent) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1); Array ( [:db_insert_placeholder_0] => 18 [:db_insert_placeholder_1] => ) in taxonomy_term_save() (line 499 of C:\wamp\www\modules\taxonomy\taxonomy.module).
The website encountered an unexpected error. Please try again later.
error 2: after drag to re-order - second error
Fatal error: Cannot access empty property in C:\wamp\www\modules\field\field.attach.inc on line 205
URL: http://example.com/admin/structure/forum