Can you place news widget on a page edit it and find the template you edited, restore it to default template and save. This will cancel all changes you made to the widget.
In case you have a custom module installed its frontend widget must have created a widget template for the module frontend widget. Can you test this on a backup test project and uninstall the module widget which will also remove its template. To remove a widget go to Administration->Settings->Advanced->toolboxes->Tollboxes->pageControls->sections (locate a section) -> (find teh widget and delete it).
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