Unable to Render - Tab Switcher

I have a puzzling error on an existing application. When I open this application and navigate to a page that I have been to many times before and have not changes, I receive the following error: Unable to render mxuiwidgetMxFormView_11 widget: Could not load class 'tabswitcher.widget.tabswitcher image below: Prior to this error, I received the same error for the Feedback widget. In order to eliminate that error, I removed the feedback widget (temporary fix, I know). Any ideas about how to identify the problem or correct this? Thanks, BTW - this is on a development instance - browser cache has been emptied - occurs on different browsers.
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