The processing instruction target matching "[xX][mM][lL]" is not allowed error appears on trying to set permissions
One answer
That's not a good sign. It appears that the process configuration (stored in XML format) is corrupted. Similar posts on the internet all point to corrupted XML content, such as this one.
http://stackoverflow.com/questions/19889132/error-the-processing-instruction-target-matching-xxmmll-is-not-allowed
Contact Support immediately for a proper investigation.
http://stackoverflow.com/questions/19889132/error-the-processing-instruction-target-matching-xxmmll-is-not-allowed
Contact Support immediately for a proper investigation.