GWT Studio plugin problem

(Using Idea 6.0.2)
Hey all. I'm walk through tutorial "Google web toolkit as 1-2-3".I'm downloaded GWT for windows 1.2.22 .But when i create GWT Configuration and run it i see for a moment GWT Development shell, and the stacktrace in console as follows:
java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:396)
at java.util.Properties.setProperty(Properties.java:128)
at java.lang.System.setProperty(System.java:700)
at com.google.gwt.dev.shell.tomcat.EmbeddedTomcatServer.]]>(EmbeddedTomcatServer.java:105)
at com.google.gwt.dev.shell.tomcat.EmbeddedTomcatServer.start(EmbeddedTomcatServer.java:38)
at com.google.gwt.dev.GWTShell.startUp(GWTShell.java:640)
at com.google.gwt.dev.GWTShell.run(GWTShell.java:447)
at com.google.gwt.dev.GWTShell.main(GWTShell.java:267)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)

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