How to debug XSLT Errors?

I'm trying to use the xslt_* functions, but I can't get any decent error messages out of them. I've used the XML and XSL I'm passing it in IE, and it gets processed and transformed correctly. The only error I get is: Warning: Sablotron error on line 1: XML parser error 4: not well-formed (invalid token) in C:\Websites\iStatus\test.php on line 16 In the log, I get: Sablotron Message on line none, level log: Parsing 'http://localhost/Simple.xsl'... So, I have an error on line 'none'? Can someone show me which line that is? My XML and XSL is processed correctly by IE, so what gives here? How can I get it to tell me what it is having a problem with? Without a line number or some context, there is no way I'll ever debug this! Using the following code: $xh = xslt_create(); xslt_set_log($xh, true); xslt_set_log($xh, getcwd() . '\sablot.log'); $args = array('/_xml' => $xml); $html = xslt_process($xh, 'arg:/_xml', "http://localhost/Simple.xsl", NULL, $args); xslt_free($xh); echo $html;