Hmm, I get the same error trying to dump the output !
String index out of range: -1
Cause java.lang.StringIndexOutOfBoundsException
Stacktrace The Error Occurred in
/srv/tomcat6/webapps/ROOT/WEB-INF/lib/railo-server/context/library/tag/Dump.cfc: line 84
It seems something is going wrong further down somewhere….