Shortcode not working

I have a problem using the shortcode in a custom buddypress tab. Here’s the code of the bp-custom.php file:

`<?php
function profile_tab_myarticles() {

global $bp;

bp_core_new_nav_item(
array(
‘name’ => ‘I miei articoli’,
‘slug’ => ‘my_articles’,
‘screen_function’ => ‘myarticles_screen’,
‘position’ => 40,
‘parent_url’ => bp_loggedin_user_domain() . ‘/my_articles/’,
‘parent_slug’ => $bp->profile->slug,
‘default_subnav_slug’ => ‘my_articles’,
)
);
}

add_action( ‘bp_setup_nav’, ‘profile_tab_myarticles’);

function myarticles_screen() {
add_action( ‘bp_template_content’, ‘myarticles_content’ );
bp_core_load_template( apply_filters( ‘bp_core_template_plugin’, ‘members/single/plugins’ ) );
}

function myarticles_content() {

if ( is_user_logged_in() )
{
echo do_shortcode(‘[frontier-post]’);
}
else
{
wp_login_form( array( ‘echo’ => true ) );
}
}

?>’

The code works great and the new tab is created but the shortcode doesn’t show anything. Thanks in advance for your support!

https://ww.wp.xz.cn/plugins/frontier-post/