The primary issue is that you must be having spaces in the path where you have depoloyed runtime.Mine runtime path was
C:\Documents and Settings\129608\jbpm-3.2.8
and I changed the same to
C:\jbpm-3.2.8 and it worked
Refer to known issue
https://issues.jboss.org/browse/GPD-385?page=com.atlassian.jira.plugin.ext.subversion%3Asubversion-commits-tabpanel