these 2 extensions uses the same tag <pdf> </pdf>
so we get error according to where the pdf file is located (internal to wiki : PDFEmbed) (external to wiki : PDFInclude)
So to prevent this incompatibility in the case of we have the 2 extensions installed
it is necessary for instance to update the tag as <pdfURL> in the delivery code of this extension PDFInclude.php
function pdfRegister() {
global $wgParser;
$wgParser->setHook( 'pdfURL', 'pdfInclude' );
return true;
}