php使用pdftk工具填写pdf表单出现的问题

1. 问题描述？

我这里希望在php中使用pdftk依赖工具来填写pdf表单后生成新的pdf

    public function testDemo(){
        $fields = [
            'name'    => 'My name',
            'address' => 'My address',
            'city'    => 'My city',
            'phone'   => 'My phone number'
        ];
        $pdf = new Pdf('template/ex93.pdf');
        $name = public_path().'/template/111111.pdf';
        $pdf->fillForm($fields)
            ->needAppearances()
            ->saveAs($name);
        if (!$pdf->saveAs($name)) {
            $error = $pdf->getError();
            dd($error);
        }
    }

这是ex93.pdf
php使用pdftk工具填写pdf表单出现的问题

2. 您实际得到的结果？

运行下来却报了个我无法理解的错误，有没有人知道这个错误是什么意思

Failed without error message: pdftk "A"="template/ex93.pdf" "fill_form" "C:\Users\admin\AppData\Local\Temp\php2D32.tmp.xfdf" "output" "C:\Users\admin\AppData\Local\Temp\tmp2D33.tmp.pdf" "drop_xfa" "need_appearances" "A"="template/ex93.pdf" "fill_form" "C:\Users\admin\AppData\Local\Temp\php2D32.tmp.xfdf" "output" "C:\Users\admin\AppData\Local\Temp\tmp2D33.tmp.pdf" "drop_xfa" "need_appearances" (Exit code: 1)