my %message_to_runmode;
$message_to_runmode{'session_error'} = 'blubberdieblubb';
$message_to_runmode{'ich_bin_auch_dabei'} = 'ich in der zweite wert';
$app->param(%message_to_runmode);

          my %message = $self->param();
          my $message1 = $message{'session_error'};
          my $message2 = $message{'ich_bin_auch_dabei'};