Wordpress import error

This is what i get when i go to import wordpress

Error message
PDOException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'name' cannot be null: INSERT INTO {ctools_object_cache} (sid, obj, name, data, updated) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4); Array ( [:db_insert_placeholder_0] => ZyMgiakaG-iqVIjJ88ELkNIhfS59a4WB32k8Z__BfNo [:db_insert_placeholder_1] => wordpress_import [:db_insert_placeholder_2] => [:db_insert_placeholder_3] => O:8:"stdClass":0:{} [:db_insert_placeholder_4] => 1344732446 ) in ctools_object_cache_set() (line 90 of /home/content/98/8824198/html/test11/sites/all/modules/ctools/includes/object-cache.inc).

or if i do the wordpress mirgation instead when i import i get this

Could not prepare directory wordpress:// - make sure your Drupal files directory exists and is writable