title: Working on GWT and App engine plugins on eclipse and found "an error occurred while trying to sign in "
body: <p>Today, I installed GWT and Google App Engine plugins for eclipse. Everything was working fine. But, when I click the sign to google, which is on the left bottom of eclipse screen, in my case, it come up with this error(in a message box) "an error occurred while trying to sign in 
  :400 bad request. See the error log for more detail". And the error log looks like this</p>
  
  <p>Message: Couldn't sign ing</p>
  
  <pre><code>com.google.api.client.http.HttpResponseException: 400 Bad Request
  at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:209)
  at com.google.api.client.auth.oauth.AbstractOAuthGetToken.execute(AbstractOAuthGetToken.java:64)
  at com.google.gdt.eclipse.login.GoogleLogin.authorizeStep1(GoogleLogin.java:535)
  at com.google.gdt.eclipse.login.GoogleLogin.logIn(GoogleLogin.java:416)
  at com.google.gdt.eclipse.login.GoogleLogin.logIn(GoogleLogin.java:379)
  at com.google.gdt.eclipse.login.ui.LoginTrimContribution$1.mouseUp(LoginTrimContribution.java:90)
  at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:219)
  at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
  at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
  at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)
  at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
  at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
  at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
  at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
  at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
  at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
  at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
  at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
  at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
  at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
  at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
  at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
  at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
  at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
  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:597)
  at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
  at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
  at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
  </code></pre>
  
  <p>I tried to find the solution on  <a href="http://code.google.com/p/googleappengine/issues/detail?id=4969" rel="nofollow">google forums</a> but couldnt find the solution.</p>
  
  <p>Can you help me please, if you encountered such problem? </p>
  
  <p>FYI: I am using Eclipse Indigo and Eclipse eclipse-java-helios-SR1</p>
  
  <p><strong>UPDATE</strong>: Solved look the comment below.</p>