Troubleshooting Websphere Commerce Developer Startup issue

If the following exception occurs starting up the websphere application server test environment in your websphere commerce toolkit 6 then

Caused by: com.ibm.ws.exception.ConfigurationWarning: 

com.ibm.etools.j2ee.commonarchivecore.exception.NoModuleFileException: 

A file does not exist for module element having uri: 

WebSphereCommerceServerExtensionsData.jar.

Do the following

1. Navigate to WC Folder in your projects explorer view
2. Right clik on WC project and select close project. 
3. Once the build completes, right click again and open the project. 
4. This will again trigger a build and updated the WC enterprise application

Then restart the websphere application server test environment. If this doesn't work then restart the workspace itself.