WP changed file shortcodes.php, and these functions have been changed:
NEW
function wpcf7_add_shortcode( $tag, $func, $has_name = false ) {
$manager = WPCF7_ShortcodeManager::get_instance();
OLD
function wpcf7_add_shortcode( $tag, $func, $has_name = false ) {
global $wpcf7_shortcode_manager;
if ( is_a( $wpcf7_shortcode_manager, ‘WPCF7_ShortcodeManager’ ) )
So we need to change the code in there phone.php within plugins/contact-form-7-phone-mask-module
Wilton Bennet