Extension Builder errors when adding Jars

[cybersonic]

n the "Java Libraries" page I click Choose File and select a file off my hard drive. Then when I click the "add jar" button, a message box appears with the following message:

An error occurred!
Action: extension.addjar
Error: can't write file [zip://C:\project\ext\test.zip!/jars/C:/project/WEB-INF/railo/temp/jettison-1.1.jar] as a file, missing parent directory [zip://C:\project\ext\test.zip!/jars/C:/project/WEB-INF/railo/temp/]
Template: C:\project\services\ExtensionManager.cfc
Line: 392

I'm not super familiar with referencing folders directly inside a zip, but I'm guessing the second expanded path from C:\ shouldn't be there. Perhaps it should have been zip://C:\project\ext\test.zip!/jars/jettison-1.1.jar
Just guessing, really. I am unable to use the Extension Builder to create extensions that need Jar files.

Environment:
Railo 4.1.0.011 rc
Windows 7 (6.1) 64bit
Apache Tomcat/7.0.39
1.7.0_21 (Oracle Corporation) 64bit