Warning: require(/var/www/html/wp-content/plugins/speaker/vendor/8.1/autoload.php): Failed to open stream: No such file or directory in /var/www/html/wp-content/plugins/speaker/src/Merkulove/Speaker/TabVoice.php on line 52

Fatal error: Uncaught Error: Failed opening required '/var/www/html/wp-content/plugins/speaker/vendor/8.1/autoload.php' (include_path='.:/usr/local/lib/php') in /var/www/html/wp-content/plugins/speaker/src/Merkulove/Speaker/TabVoice.php:52
Stack trace:
#0 /var/www/html/wp-content/plugins/speaker/src/Merkulove/Speaker/TabVoice.php(113): Merkulove\Speaker\TabVoice::require_tts()
#1 /var/www/html/wp-content/plugins/speaker/src/Merkulove/Speaker/Config.php(208): Merkulove\Speaker\TabVoice::controls(Array)
#2 /var/www/html/wp-content/plugins/speaker/speaker.php(97): Merkulove\Speaker\Config->prepare_settings()
#3 /var/www/html/wp-includes/class-wp-hook.php(310): Merkulove\Speaker->setup('')
#4 /var/www/html/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(NULL, Array)
#5 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#6 /var/www/html/wp-settings.php(495): do_action('plugins_loaded')
#7 /var/www/html/wp-config.php(257): require_once('/var/www/html/w...')
#8 /var/www/html/wp-load.php(50): require_once('/var/www/html/w...')
#9 /var/www/html/wp-blog-header.php(13): require_once('/var/www/html/w...')
#10 /var/www/html/index.php(17): require('/var/www/html/w...')
#11 {main}
  thrown in /var/www/html/wp-content/plugins/speaker/src/Merkulove/Speaker/TabVoice.php on line 52