fatal error when activated

  • Fatal error: Uncaught Error: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class Puvox\standard_wp_library does not have a method “ManagerPageValue”
    in /home/xxx/public_html/wp-content/plugins/external-url-as-post-featured-image-thumbnail/library_default_puvox.php on line 7841

    Call stack:

    call_user_func_array()
    wp-content/plugins/external-url-as-post-featured-image-thumbnail/library_default_puvox.php:7841
    Puvox\default_plugin::__call()
    wp-content/plugins/external-url-as-post-featured-image-thumbnail/library_default_puvox.php:8081
    Puvox\default_plugin::activate()
    wp-includes/class-wp-hook.php:307
    WP_Hook::apply_filters()
    wp-includes/class-wp-hook.php:331
    WP_Hook::do_action()
    wp-includes/plugin.php:474
    do_action()
    wp-admin/plugins.php:194

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