Flexunit on a headless mac server

Has anyone successfully ran flexUnit on a headless mac?

im running ant builds via Jenkins, it will build a flex app no problem, however when I try to build the sample flexunit CI app I get the followin error

[flexunit] LSOpenURLsWithRole() failed with error -10810 for the file /Library/Jenkins/jobs/flexUnitSampleCIProject/workspace/target/bin/TestRunner.swf.

im using the Jenkins Xvnc plugin wich looks like it is working however I notice flexUnit is using the following settings

 [flexunit] Using the following settings for the test run:
 [flexunit] FLEX_HOME: [/Library/Flex/flex_sdk_4]
 [flexunit] haltonfailure: [false]
 [flexunit] headless: [false]
 [flexunit] display: [99]
 [flexunit] localTrusted: [false]
 [flexunit] player: [flash]
 [flexunit] port: [1024]
 [flexunit] swf: [/Library/Jenkins/jobs/flexUnitSampleCIProject/workspace/target/bin/TestRunner.swf]
 [flexunit] timeout: [60000ms]
 [flexunit] toDir: [/Library/Jenkins/jobs/flexUnitSampleCIProject/workspace/target/report]

If I set headless = true build fails with

[flexunit] Validating task attributes ... 
[flexunit] OS: [Mac] 

Any help would be greatly apricated