Custom Post Type Error

[slobich]

you’re missing the namespace in the add_action part. it should be:
add_action( 'init', __NAMESPACE__ . '\\technology_platform', 0 );

check here:

Error when adding functions in extras.php

When trying to create a Custom post type, placing standard code in extras.php I get this error: PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'my_custom_post_type' not found or invalid function name in /path_wp/wp-includes/plugin.php on line 496 Instead, If I place the code inside functions.php it works. Notice that this procedure always worked with the old Roots theme. It’s the same when try to adding my taxonomies. How to solve it?

and some more info about namespaces here: https://roots.io/upping-php-requirements-in-your-wordpress-themes-and-plugins/