Error message

• Warning: count(): Parameter must be an array or an object that implements Countable in _filter_url() (line 1535 of /virtual/primaschool.gr/htdocs/modules/filter/filter.module).
• Notice: Trying to access array offset on value of type bool in _filter_url() (line 1541 of /virtual/primaschool.gr/htdocs/modules/filter/filter.module).
• Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in i18n_book_navigation_set_breadcrumb() (line 212 of /virtual/primaschool.gr/htdocs/sites/all/modules/i18n_book_navigation/i18n_book_navigation.module).
• Notice: Trying to access array offset on value of type bool in i18n_book_navigation_preprocess_i18n_book_navigation() (line 429 of /virtual/primaschool.gr/htdocs/sites/all/modules/i18n_book_navigation/i18n_book_navigation.module).
• Notice: Trying to access array offset on value of type bool in i18n_book_navigation_preprocess_i18n_book_navigation() (line 430 of /virtual/primaschool.gr/htdocs/sites/all/modules/i18n_book_navigation/i18n_book_navigation.module).