Error Running GWT in x86_64 Linux

Hi All,
I just started using GWT and I'm having some problems getting my GWT
project in Eclipse to run. I started by creating a new Web Application
Project, clicked the project and tried to run it but I'm getting this
error when it runs:

The browser widget class could not be instantiated.

[ERROR] The browser widget class could not be instantiated
org.eclipse.swt.SWTError: XPCOM error -2147221164
at org.eclipse.swt.browser.Browser.error(Browser.java:1336)
at org.eclipse.swt.browser.Browser.<init>(Browser.java:236)
at com.google.gwt.dev.shell.BrowserWidget.<init>(BrowserWidget.java:
257)
at com.google.gwt.dev.shell.moz.BrowserWidgetMoz.<init>
(BrowserWidgetMoz.java:103)
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:513)
at com.google.gwt.dev.shell.PlatformSpecific.createBrowserWidget
(PlatformSpecific.java:107)
at com.google.gwt.dev.SwtHostedModeBase.openNewBrowserWindow
(SwtHostedModeBase.java:179)
at com.google.gwt.dev.SwtHostedModeBase.launchStartupUrls
(SwtHostedModeBase.java:162)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:402)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)

I tried the same steps on WindowsXP (x86_64) and didn't encounter the
same problem. Any help would be appreciated.

Thanks,
- Jeff

Configuration:
Linux Kernel: 2.6.29.4-167.fc11.x86_64
Eclipse 3.5.1 M20090917-0800 (I tried 32bit and 64bit)
Java jdk1.6.0_17 (tried 32bit and 64bit)
GWT 1.7.1
Google App Engine 1.2.6
Google Plugin 1.1.2

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