Error Message
You get the following error when you open the HxGN SDx Desktop Client after upgrading the HxGN SDx Connector for Plant Maintenance from version v10.0.22.10 to version v10.0.42.10.
'Object Reference not set to an instance of an object'
Cause
Version v10.0.22.10 of the HxGN SDx Connector for Plant Maintenance does not support side-by-side installation, and it works only with either HxGN SDx or SmartPlant Foundation.
When you uninstall version v10.0.22.10 of the HxGN SDx Connector for Plant Maintenance after upgrading the HxGN SDx to Update 29 or later, the SpecializationValuesSDAPM.xml file remains in the site path. When you install v10.0.42.10 of the HxGN SDx Connector for Plant Maintenance, the SpecializationValues_SDxConnectors.xml file is added to the site path. The duplication of both the xml files in the site path causes an error when you open the HxGN SDx Desktop Client.
Solution
You must manually remove the SpecializationValuesSDAPM.xml file from the site path.