domPDF doesn’t work

[eluser]B3ll4triX[/eluser]
maybe is simple question. i'am try to generate html pages to pdf with dompdf. But, i get some error like this.

Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 1572864 bytes) in D:\@ Server\wamp\www\unisba\system\plugins\dompdf\lib\class.pdf.php(2219) : eval()'d code on line 5914

How to fixed this problem

-th4nx b4-