Подскажите в чем проблема ? 
  
all:  revision:  BUILD FAILED C:\Start Source\66\Source\ant\build.xml:5: The following error occurred while executing this line: C:\Start Source\66\Source\ant\build.xml:34: Execute failed: java.io.IOException: Cannot run program "hg" (in directory "C:\Start Source\66\Source"): CreateProcess error=2, ?? ??????? ????? ????????? ????     at java.lang.ProcessBuilder.start(ProcessBuilder.java:1047)     at java.lang.Runtime.exec(Runtime.java:617)     at org.apache.tools.ant.taskdefs.launcher.Java13CommandLauncher.exec(Java13CommandLauncher.java:58)     at org.apache.tools.ant.taskdefs.Execute.launch(Execute.java:428)     at org.apache.tools.ant.taskdefs.Execute.execute(Execute.java:442)     at org.apache.tools.ant.taskdefs.ExecTask.runExecute(ExecTask.java:628)     at org.apache.tools.ant.taskdefs.ExecTask.runExec(ExecTask.java:669)     at org.apache.tools.ant.taskdefs.ExecTask.execute(ExecTask.java:495)     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)     at java.lang.reflect.Method.invoke(Method.java:606)     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)     at org.apache.tools.ant.Task.perform(Task.java:348)     at org.apache.tools.ant.Target.execute(Target.java:435)     at org.apache.tools.ant.Target.performTasks(Target.java:456)     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)     at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)     at org.apache.tools.ant.Project.executeTargets(Project.java:1248)     at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:441)     at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:105)     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)     at java.lang.reflect.Method.invoke(Method.java:606)     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)     at org.apache.tools.ant.Task.perform(Task.java:348)     at org.apache.tools.ant.Target.execute(Target.java:435)     at org.apache.tools.ant.Target.performTasks(Target.java:456)     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)     at org.apache.tools.ant.Project.executeTarget(Project.java:1364)     at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)     at org.apache.tools.ant.Project.executeTargets(Project.java:1248)     at org.apache.tools.ant.Main.runBuild(Main.java:851)     at org.apache.tools.ant.Main.startAnt(Main.java:235)     at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)     at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109) Caused by: java.io.IOException: CreateProcess error=2, ?? ??????? ????? ????????? ????     at java.lang.ProcessImpl.create(Native Method)     at java.lang.ProcessImpl.<init>(ProcessImpl.java:385)     at java.lang.ProcessImpl.start(ProcessImpl.java:136)     at java.lang.ProcessBuilder.start(ProcessBuilder.java:1028)     ... 38 more  Total time: 1 second