Tsung load test from mac os x

I am trying to fire off a Tsung request from my Mac OS X machine and i'm not having much luck. I have edited the ~/.tsung/tsung.xml config file and even tried changing the location of that file on several occasions with the -f parameter. When I run tsung start it returns this output ``` dave:/Applications/MAMP/htdocs/barebonessite/wp-content/themes/barebones $ tsung -f ~/.tsung/tsung.xml -l . start Starting Tsung "Log directory is: /Applications/MAMP/htdocs/barebonessite/wp- content/themes/barebones/./20130503-1325" Config Error, aborting ! {{case_clause,{error,enoent}}, [{xmerl_scan,fetch_DTD,2, [{file,"xmerl_scan.erl"},{line,1283}]}, {xmerl_scan,scan_doctype2,3, [{file,"xmerl_scan.erl"},{line,1227}]}, {xmerl_scan,scan_prolog,4, [{file,"xmerl_scan.erl"},{line,722}]}, {xmerl_scan,scan_document,2, [{file,"xmerl_scan.erl"},{line,563}]}, {xmerl_scan,file,2, [{file,"xmerl_scan.erl"},{line,249}]}, {ts_config,read,2, [{file,"src/tsung_controller/ts_config.erl"}, {line,68}]}, {ts_config_server,handle_call,3, [{file, "src/tsung_controller/ts_config_server.erl"}, {line,198}]}, {gen_server,handle_msg,5, [{file,"gen_server.erl"},{line,588}]}]} ``` My config file looks like this: ``` <?xml version="1.0"?> <!DOCTYPE tsung SYSTEM "/usr/share/tsung/tsung-1.0.dtd"> <tsung loglevel="notice" version="1.0"> <clients> <client host='localhost' use_controller_vm='true'/> </clients> <servers> <server host="54.225.212.193" port="80" type="tcp"></server </servers> <load> <arrivalphase phase="1" duration="10" unit="minute"> <users maxnumber="650" arrivalrate="8" unit="second"/> </arrivalphase> </load> <sessions> <session probability="100" name="ab" type="ts_http"> <for from="1" to="20" var="i"> <request> <http url="/" method="GET" version="1.1"/> </request> </for> </session> </sessions> </tsung> ``` Being new to Tsung I cannot work out the problem here and the error reporting is pretty low level stuff and makes little sense.