problem with using dompdf

[eluser]splendidus[/eluser]
Can you give details about where the error occurs (i.e. in my case it was stated, that the error was at the beginning of the css file)?
What is the error message exactly?

[eluser]ClaudioBasckeira[/eluser]
Tomorrow at work i can copy the exact error, but what i get is pretty much this error from the first post:

A PHP Error was encountered
Severity: Warning
Message: DOMXPath::query() [function.DOMXPath-query]: Invalid expression
Filename: include/stylesheet.cls.php
Line Number: 573

Only mine occurs at line 614.

I'm using the latest version and everything works fine on my machine, but when i upload it to the server(hosted at powervps) i get the error when i try to generate the pdf, regardless of what are its contents. And i'm not using any css(external or not) at all!