You are not allowed to edit posts in this post type

Having the same problem, I would really love to use this plugin as it has all the features I need for my educational blog.

try:
wp-admin/edit.php
comment code:
// if ( ! in_array( $typenow, get_post_types( array( ‘show_ui’ => true ) ) ) ) {
// wp_die( __( ‘You are not allowed to edit posts in this post type.’ ) );
// }

Fix works well for me. I’m not keen on editing core files though so I tried changing line 52 of wp-content/plugins/wpcues-basic-quiz/common/classes/wpcue_basic_quiz.php to read:

‘show_ui’ => true,

That seems to do the same thing but it’s local to the plugin code rather than Wp core so is less likely to get overwritten by updates.