Error while downloading code into robot

[RoboElite640]

I get an error while downloading the code from netbeans to the robot. The error code comes out as:

C:\Documents and Settings\Developer\sunspotfrcsdk\build.xml:95: The following error occurred while executing this line:
C:\Documents and Settings\Developer\sunspotfrcsdk\ant\upgrade.xml:4 0:
java.net.SocketException: Socket operation on nonsocket: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl .java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSoc ketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.j ava:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.j ava:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at java.net.Socket.<init>(Socket.java:375)
at java.net.Socket.<init>(Socket.java:189)
at org.apache.commons.net.DefaultSocketFactory.create Socket(DefaultSocketFactory.java:53)
at org.apache.commons.net.SocketClient.connect(Socket Client.java:162)
at org.apache.commons.net.SocketClient.connect(Socket Client.java:250)
at com.sun.spot.sdk.tool.ftp.JakartaFtpWrapper.connec tAndLogin(JakartaFtpWrapper.java:37)
at com.sun.spot.sdk.tool.ftp.UpgradeTask.execute(Upgr adeTask.java:114)
at org.apache.tools.ant.UnknownElement.execute(Unknow nElement.java:291)
at sun.reflect.GeneratedMethodAccessor149.invoke(Unkn own Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execut e(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:39 0)
at org.apache.tools.ant.Target.performTasks(Target.ja va:411)
at org.apache.tools.ant.Project.executeSortedTargets( Project.java:1397)
at org.apache.tools.ant.helper.SingleCheckExecutor.ex ecuteTargets(SingleCheckExecutor.java:38)
at org.apache.tools.ant.Project.executeTargets(Projec t.java:1249)
at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java :442)
at org.apache.tools.ant.taskdefs.CallTarget.execute(C allTarget.java:105)
at org.apache.tools.ant.UnknownElement.execute(Unknow nElement.java:291)
at sun.reflect.GeneratedMethodAccessor149.invoke(Unkn own Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execut e(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:39 0)
at org.apache.tools.ant.Target.performTasks(Target.ja va:411)
at org.apache.tools.ant.Project.executeSortedTargets( Project.java:1397)
at org.apache.tools.ant.Project.executeTarget(Project .java:1366)
at org.apache.tools.ant.helper.DefaultExecutor.execut eTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Projec t.java:1249)
at org.apache.tools.ant.module.bridge.impl.BridgeImpl .run(BridgeImpl.java:281)
at org.apache.tools.ant.module.run.TargetExecutor.run (TargetExecutor.java:539)
at org.netbeans.core.execution.RunClassThread.run(Run ClassThread.java:154)

can anyone provide help or tips