:ant
java.lang.IllegalArgumentException: URI has an authority component

at java.io.File.<init>(File.java:340) 
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at org.apache.tools.ant.launch.Locator.fromURI(Locator.java:165)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:245)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)