Thanks Thomas. I just thought I will add to the details of the error
by adding the stack trace that is produced when I run the code in Dev
Mode. Below:

com.google.gwt.core.client.JavaScriptException: (TypeError):
$doc.createStyleSheet is not a function
com.google.gwt.core.client.JavaScriptException: (TypeError):
$doc.createStyleSheet is not a function
        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.dom.client.StyleInjector
$StyleInjectorImplIE.createElement(StyleInjector.java)
        at com.google.gwt.dom.client.StyleInjector
$StyleInjectorImplIE.createElement(StyleInjector.java)
        at com.google.gwt.dom.client.StyleInjector
$StyleInjectorImplIE.createNewStyleSheet(StyleInjector.java:186)
        at com.google.gwt.dom.client.StyleInjector
$StyleInjectorImplIE.injectStyleSheet(StyleInjector.java:118)
        at
com.google.gwt.dom.client.StyleInjector.flush(StyleInjector.java:362)
        at com.google.gwt.dom.client.StyleInjector.access
$1(StyleInjector.java:347)
        at com.google.gwt.dom.client.StyleInjector
$1.execute(StyleInjector.java:199)
        at com.google.gwt.core.client.impl.SchedulerImpl$Task
$.executeScheduled$(SchedulerImpl.java:50)
        at
com.google.gwt.core.client.impl.SchedulerImpl.runScheduledTasks(SchedulerImpl.java:
229)
        at
com.google.gwt.core.client.impl.SchedulerImpl.flushFinallyCommands(SchedulerImpl.java:
328)
        at com.google.gwt.core.client.impl.Impl.exit(Impl.java:238)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        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
com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:409)
        at
com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:
193)
        at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
510)
        at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
352)
        at java.lang.Thread.run(Thread.java:662)
com.google.gwt.core.client.JavaScriptException: (Error): Invalid
argument.
com.google.gwt.core.client.JavaScriptException: (Error): Invalid
argument.
        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.apply(Impl.java)
        at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
        at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown
Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        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(Thread.java:662)
com.google.gwt.core.client.JavaScriptException: (Error): Invalid
argument.
com.google.gwt.core.client.JavaScriptException: (Error): Invalid
argument.
        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.apply(Impl.java)
        at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
        at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown
Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        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(Thread.java:662)
com.google.gwt.core.client.JavaScriptException: (Error): Invalid
argument.
com.google.gwt.core.client.JavaScriptException: (Error): Invalid
argument.
        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.apply(Impl.java)
        at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
        at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown
Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        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(Thread.java:662)
com.google.gwt.core.client.JavaScriptException: (Error): Invalid
argument.
com.google.gwt.core.client.JavaScriptException: (Error): Invalid
argument.
        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.apply(Impl.java)
        at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
        at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown
Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        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(Thread.java:662)
com.google.gwt.core.client.JavaScriptException: (Error): Invalid
argument.
com.google.gwt.core.client.JavaScriptException: (Error): Invalid
argument.
        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.apply(Impl.java)
        at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
        at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown
Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        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(Thread.java:662)
com.google.gwt.core.client.JavaScriptException: (Error): Invalid
argument.
com.google.gwt.core.client.JavaScriptException: (Error): Invalid
argument.
        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.apply(Impl.java)
        at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
        at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown
Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        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(Thread.java:662)

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