TypeError: this.view_manager is null
http://localhost:8069/web/static/src/js/widgets/debug_manager.js:35 Traceback: DebugManager<._update@http://localhost:8069/web/static/src/js/widgets/debug_manager.js:35:13 DebugManager<.render_dropdown@http://localhost:8069/web/static/src/js/widgets/debug_manager.js:51:18 Widget<.proxy/<@http://localhost:8069/web/static/src/js/framework/widget.js:398:20 jQuery.event.dispatch@http://localhost:8069/web/static/lib/jquery/jquery.js:4640:50 jQuery.event.add/elemData.handle@http://localhost:8069/web/static/lib/jquery/jquery.js:4309:41
