What is error 2 using XSLT with Sablotron

We've compiled PHP with XSLT support (finally after many attempts). When we do a PHP info it says that Sablotron support is enabled however whenever we try the example in the xslt_process (http://www.php.net/manual/function.xslt-process.php) section of the documentation we get an error 2 with no text message. Does anyone know what's going on. We compiled apache on Red Hat 6.2 and are running it on Red Hat 7.0 (as many of you know it's a miracle when anything compiles on Red Hat 7.0). Everything seams to be running fine except Sablotron support. Any suggestions? Thanks, Mike