1) remove following thexts from build.xml (e.g. using search/replace for empty string):
/home/kverlaen/Desktop/install-eclipse-jbpm.swf
/home/kverlaen/Desktop/install-guvnor-jbpm.swf
2) delete new line between lines 514 and 515
There are (randomly pasted?) file names in target dependencies making build of install.demo fail on lines 514 and 515