Roni,
Go back into your AGOL account and edit this app by removing the basemap gallery widget. Once the app is functioning properly again the you can try to re-add the widget.
Los miembros registrados pueden publicar, seguir actualizaciones y más. ¿Nuevo aquí? Regístrate gratis.
Find useful guides, FAQs, and documents to help you navigate and make the most of Esri Community.