The following error was shown on the browser at run-time:

Error: 'ZC' is undefined

Possible causes:

1. Incorrect syntax in linking an external JavaScript
   
   If external JavaScript files are referred, make sure the <script> syntax be:
   
       <script type="text/javascript" src="external.js"></script>
   
   instead of:
   
       <script type="text/javascript" src="external.js" />
    
2. Load WebDock or WebSplitter in Ajax response, but not in initial page-load