Pdf split is not working in laravel using Ilovepdf api

I am trying to split pdf file with help of ilovepdf api . code is not giving any error but also not working .

Controller

  $ilovepdf = new Ilovepdf('project_public', 'secret_key_');
        // Create a new task
        $myTaskSplit = $ilovepdf->newTask('split');
        // Add files to task for upload
        $myTaskSplit->addFile(__DIR__.'/files/abc.pdf');
        // Set your tool options
        $myTaskSplit->setFixedRange(2);
        // Execute the task
        $myTaskSplit->execute();
        // Download the package files
        return $myTaskSplit->download();
    ```

I want to split pdf file and download it.

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