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Null Pointer error with IWDPageService

Experts,

I am encountering a development scenario where it makes sense to use IWDPageService. However, while the Web Dynpro project builds just fine on my local machine, when I run it in EP, I get a NullPointerException.

Here is some sample code that generates the exception:

IWDPageService pageService = (IWDPageService) WDPortalUtils.getService(WDPortalServiceType.PAGE_SERVICE);
String[] iViews = pageService.getVisibleIViews();

Is there some sort of library reference that I need to specify before deploying?

Thank you for any help you can provide.

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