Php WooCommerce PDF发票和装箱单在服务器上不起作用

WooCommerce PDF发票和装箱单在本地主机上运行良好，但在服务器主机上不起作用。它显示出任何致命的错误

 Fatal error: Out of memory (allocated 36175872) (tried to allocate 133061 bytes) in /homepages/18/d323269449/htdocs/test.addpronetwork.com/flexotech-eCommerce/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/lib/dompdf/lib/class.pdf.php on line 2157

如何解决这个问题

我已经在我的站点中定义了以下限制

memory_limit = 512M; 
max_execution_time =3000;
upload_max_filesize = 512M;
post_max_size = 512M;
max_input_vars = 10000;