Description of problem:
A error message dialog titled "ERROR: SimplePanel can only contain one child widget" showed up immediately after the WebTrans page was loaded.

Version-Release number of selected component (if applicable):
Zanata version 1.8.0-SNAPSHOT (20120906-0954)


How reproducible:
Always

Steps to Reproduce:
1. On any project page, click any active version
2. Click language you want to translate
3. Click the doucment you want to translate
  
Actual results:
A error message dialog titled "ERROR: SimplePanel can only contain one child widget" showed up immediately.

The content of the error message:
=========================================
Stack trace for the error:

Unknown.sK(JsArrayString.java:42)
	Unknown.zK(StackTraceCreator.java:168)
	Unknown.eK(StackTraceCreator.java:421)
	Unknown.we(Throwable.java:72)
	Unknown.pe(Throwable.java:46)
	Unknown.te(Throwable.java:52)
	Unknown.WA(Exception.java:29)
	Unknown.aB(RuntimeException.java:29)
	Unknown.rTc(IllegalStateException.java:28)
	Unknown.aic(SimplePanel.java:67)
	Unknown.dze(GlossaryView.java:231)
	Unknown.ZId(GlossaryPresenter.java:251)
	Unknown.LJd(GlossaryPresenter.java:227)
	Unknown.PJd(GlossaryPresenter.java:222)
	Unknown.S4d(SeamDispatchAsync.java:90)
	Unknown.W4d(SeamDispatchAsync.java:88)
	Unknown.Q9b(RequestCallbackAdapter.java:232)
	Unknown.A_(Request.java:287)
	Unknown.k0(RequestBuilder.java:395)
	Unknown.anonymous(XMLHttpRequest.java:287)
	Unknown.gJ(Impl.java:168)
	Unknown.jJ(Impl.java:213)
	Unknown.anonymous(Impl.java:57)
	

Please recall your actions and take one of the following steps:

    Check if it's a known issue; Or
    Report a problem; Or
    Email Zanata users mailing list
========================================================

Expected results:
Enter without any problem.

Additional info:
You can just close the dialog and continue editing.