i solve my issue my self by replacing some code as below
i replaced
register_activation_hook( __FILE__, 'psp_add_project_management_role' );
To
add_action('admin_init','add_testimonial_management_role',998);
i solve my issue my self by replacing some code as below
i replaced
register_activation_hook( __FILE__, 'psp_add_project_management_role' );
To
add_action('admin_init','add_testimonial_management_role',998);