theme:compile: Attempted to load class "Autoprefixer" from namespace "Padaliyajay\PHPAutoprefixer"

Hallo,

leider bekomme ich nach einem composer update folgende Fehlermeldung beim kompilieren.
Hat jemand eine Idee was ich tun kann?

> bin/console theme:compile
        Start theme compilation

        In ThemeCompiler.php line 216:

          Attempted to load class "Autoprefixer" from namespace "Padaliyajay\PHPAutop
          refixer".
          Did you forget a "use" statement for another namespace?


        theme:compile [-h|--help] [-q|--quiet] [-v|vv|vvv|--verbose] [-V|--version] [--ansi] [--no-ansi] [-n|--no-interaction] [-e|--env ENV] [--no-debug] [--] 


Execution aborted, a subcommand failed!