错误日志：
[java] 2014-09-26 10:12:17,031 (http-bio-0.0.0.0-8443-exec-5) [ ControlServlet.java:233:ERROR]
[java] ---- exception report ----------------------------------------------------------
[java] Error in request handler:
[java] Exception: org.ofbiz.widget.screen.ScreenRenderException
[java] Message: Error rendering screen [component://common/widget/CommonScreens.xml#login]: java.lang.IllegalArgumentException: Could not find screen with name [main-decorator] in class resource [component://practice/widget/PracticeScreens.xml] (Could not find screen with name [main-decorator] in class resource [component://practice/widget/PracticeScreens.xml])
[java] ---- cause ---------------------------------------------------------------------
[java] Exception: java.lang.IllegalArgumentException
[java] Message: Could not find screen with name [main-decorator] in class resource [component://practice/widget/PracticeScreens.xml]
[java] ---- stack trace ---------------------------------------------------------------
[java] java.lang.IllegalArgumentException: Could not find screen with name [main-decorator] in class resource [component://practice/widget/PracticeScreens.xml]
[java] org.ofbiz.widget.screen.ScreenFactory.getScreenFromLocation(ScreenFactory.java:103)
[java] org.ofbiz.widget.screen.ScreenFactory.renderReferencedScreen(ScreenFactory.java:195)
[java] org.ofbiz.widget.screen.ModelScreenWidget$DecoratorScreen.renderWidgetString(ModelScreenWidget.java:585)
[java] org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:104)
[java] org.ofbiz.widget.screen.ModelScreenWidget$Section.renderWidgetString(ModelScreenWidget.java:191)
[java] org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:396)
[java] org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:135)
[java] org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:97)
[java] org.ofbiz.widget.screen.ScreenWidgetViewHandler.render(ScreenWidgetViewHandler.java:101)
[java] org.ofbiz.webapp.control.RequestHandler.renderView(RequestHandler.java:868)
[java] org.ofbiz.webapp.control.RequestHandler.doRequest(RequestHandler.java:582)
[java] org.ofbiz.webapp.control.ControlServlet.doGet(ControlServlet.java:224)
[java] javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
[java] javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
[java] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
[java] org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
[java] org.ofbiz.webapp.control.ContextFilter.doFilter(ContextFilter.java:337)
[java] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
[java] org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
[java] org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
[java] org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
[java] org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
[java] org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
[java] org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
[java] org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
[java] org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
[java] org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
[java] org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
[java] org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
[java] org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
[java] java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
[java] java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
[java] org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
[java] java.lang.Thread.run(Thread.java:662)
[java] --------------------------------------------------------------------------------
解决问题：在practice/widget/PracticeScreens.xml中添加如下配置即可
<screen name="main-decorator">
<section>
<actions>
<property-map resource="CommonUiLabels" map-name="uiLabelMap" global="true"/>
<property-map resource="PracticeUiLabels" map-name="uiLabelMap" global="true"/>
<set field="layoutSettings.companyName" from-field="uiLabelMap.PracticeCompanyName" global="true"/>
<set field="layoutSettings.label1" from-field="uiLabelMap.PracticeApplication" global="true"/>
<set field="layoutSettings.label1" from-field="uiLabelMap.PracticeApplication" global="true"/>
<set field="activeApp" value="practice" global="true"/>
<set field="applicationMenuName" value="PracticeAppBar" global="true"/>
<set field="applicationMenuLocation" value="component://practice/widget/PracticeMenus.xml" global="true"/>
</actions>
<widgets>
<include-screen name="GlobalDecorator" location="component://common/widget/CommonScreens.xml"/>
</widgets>
</section>
</screen>