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So, with the release 1.6-1 I’m still having the error 500. It conflicted with Advanced custom field plugin.
Fatal error: Cannot redeclare acf_shortcode() (previously declared in /wp-content/plugins/advanced-custom-fields/includes/api/api-template.php:933) in /wp-content/plugins/blackfyre_custom_post_types/blackfyre_custom_post_types.php on line 326