FlexTable - removeRow with image widget (cell) causes JavaScriptException

We use FlexTable to display error messages and clear them later. We
use the following code to achieve this.

FlexTable messages = new FlexTable();
Image image = new Image();
image.setUrl("images/warning.gif");
messages.setWidget(0, 0, image);
messages.setWidget(0 1, status_message);

We remove the messages using:

messages.removeRow(0);

This worked until GWT 2.0.4 release. But starting from GWT 2.2.0, I
get "Unspecified error." Same error also exists in GWT 2.3.0.

The worst part was the error did not indicate the cause or location of
the problem. Try-catch did not catch it either. Given the complexity
of our app, it took several days to find out the cause of the problem.
I guess somebody at GWT team did not get enough sleep during the
recent releases. I hope you guys will fix it soon. Below, please find
the detailed error.

(CustomUnCaughtExceptionHandler.java:44) 2011-06-30 20:06:34,161
[ERROR] CustomExceptionHandler. Message : (Error): Unspecified error.,
Cause : null, LocalizedMessage : (Error): Unspecified error.,
StackTrace : [Ljava.lang.StackTraceElement;@1ed8762
com.google.gwt.core.client.JavaScriptException: (Error): Unspecified
error.
at
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:
237)
at
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:
132)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:
561)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:
269)
at
com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:
91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
at sun.reflect.GeneratedMethodAccessor531.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:
103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:
71)
at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
167)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:
281)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
531)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
352)
at java.lang.Thread.run(Unknown Source)

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