QGIS » QGIS Application

1. Create postgis topology layers http://postgis.net/docs/Topology.html
2. Open DB Manager and select postgis schema contening topology layers
3. In "Schema" menu clic on "Topoviewer"
   Python error :
   

   
   AttributeError: 'QgsLayerTreeLayer' object has no attribute 'setVisible' 
   Traceback (most recent call last):
     File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\db_manager\db_manager.py", line 227, in invoke_callback
       return self.invokeCallback(callback)
     File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\db_manager\db_manager.py", line 297, in invokeCallback
       callback(self.tree.currentItem(), self.sender(), self, *params)
     File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\db_manager\db_plugins\postgis\plugins\qgis_topoview\__init__.py", line 238, in run
       nodeLayer.setVisible(Qt.Unchecked)
   AttributeError: 'QgsLayerTreeLayer' object has no attribute 'setVisible'
   
   Python version: 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit (AMD64)] 
   QGIS version: 3.0.0-Girona Girona, 001c80b0c3 
   
   Python Path:
   C:/Users/ariviere/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\gml_application_schema_toolbox\extlibs
   C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python
   C:/Users/ariviere/AppData/Roaming/QGIS/QGIS3\profiles\default/python
   C:/Users/ariviere/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins
   C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins
   C:\Program Files\QGIS 3.0\bin\python36.zip
   C:\PROGRA~1\QGIS3~1.0\apps\Python36\DLLs
   C:\PROGRA~1\QGIS3~1.0\apps\Python36\lib
   C:\Program Files\QGIS 3.0\bin
   C:\PROGRA~1\QGIS3~1.0\apps\Python36
   C:\PROGRA~1\QGIS3~1.0\apps\Python36\lib\site-packages
   C:/Users/ariviere/AppData/Roaming/QGIS/QGIS3\profiles\default/python
   C:/Users/ariviere/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\go2mapillary
   C:\Users\ariviere\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins\go2mapillary\extlibs
   

It works on QGIS 2.18