how to pass parameter?

[juanledesma]

how a parameter is sent to the report, for example the title of this.

the error that I get is Undefined offset: 0.
` $output = [];
$returnVar = 0;

    chdir($this->pathExecutable);
    exec($this->command, $output, $returnVar);
    if ($returnVar !== 0) {
        //throw new \PHPJasper\Exception\ErrorCommandExecutable();
        throw new \Exception("{$output[0]}", 1);
    }

    return $output;
}`

uso laravel 5.6