The editor has encountered an unexpected error.

Hey @permanyer,

thanks for opening the issue! Could you post a list with the plugins you have active besides Lazy Loader? Is there something that disabled REST API features or something like that?

And, if possible: Could you disable the other plugins and check if it is working then?

Best,
Florian

PS: tried to reproduce it, but it seems to work for me with Gutenberg plugin active.

Hi,

I deactivated all the plugins except Lazy loader and the problem persisted, so it is something with the theme.

The only way i found to avoid the problem is to comment the line ‘show_in_rest’ => true, when registering the custom post type (that is, deactivating gutenberg).

So, if the post is registered without gutenberg, there is no error when editing this post together with the option “Enable option to disable plugin per page/post” of the lazy loader plugin.

register_post_type('project', array(
        'label' => __('Projecte', 'threeten_admin'),
        'public' => true,
        'capability_type' => 'post',
        'map_meta_cap' => true,
        'rewrite' => array('slug' => 'project'),
        'query_var' => 'project',
       // 'show_in_rest' => true,
        'supports' => array('title', 'page-attributes', 'editor', 'thumbnail'),
        'labels' => get_custom_post_type_labels(__('Projecte', 'threeten_admin'),__('Projectes', 'threeten_admin')) 
    ));

Hi,

ah, seeing the code I think I might know what the issue is (had a similar issue one time). Could you try to add custom-fields to the supports array and check if it works then?

Best,
Florian

Marking that as resolved because there was no feedback to last reply.