I couldn't place the block and the following error message appeared in the console:
An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: /en/admin/structure/block/add/custom_book_navigation/mnm_theme?region=sidebar_first
StatusText: OK
ResponseText:
Fatal error: Declaration of Drupal\custom_book_block\Plugin\Block\CustomBookNavigationBlock::defaultConfiguration() must be compatible with Drupal\book\Plugin\Block\BookNavigationBlock::defaultConfiguration(): array in /Users/davidschuch/Sites/mnm2/repo/www/modules/contrib/custom_book_block/src/Plugin/Block/CustomBookNavigationBlock.php on line 26"The problem is that several return types were added in the latest version of Book module in the BookNavigationBlock class. This is the class that is extended by Custom Book Block module.
Active
1.1
Code
I will mark this issue as fixed after the changes in 💬 Cannot install 1.1 with contrib Book v2 Active . Please use version ^2.0 when using the contrib book module ^2.0.
Automatically closed - issue fixed for 2 weeks with no activity.