Actionscript 3.0 :: Can't Read XML Generated By PHP

I´ve been trying to write AS3 that can read xml which is dynamically generated by php. i´ve generated the xml in several ways -- all of which seem to work but i keep getting the error,

Error #1088: The markup in the document following the root element must be well-formed,when i try to load the xml into flash. however the xml (as viewed when you go to "view source" in your browser) is indeed well formed.i´ve seen various discussions where people bring up this problem but haven´t seen a solution in any of them.

i have 4 versions of the php. the first just uses echo. the second uses echo but i wrap it in {start_ob(),ob_end_flush()}; then i use simpleXML and finally i use domdocument. the first 3 give the error above, the domdocument throws no error but the xml is empty.

i´ll start with the simplified flash code:

Code: Select allvar path:String = "php/videos.php"
//
var ldr:URLLoader = new URLLoader()

[code]....