D:\a\OpenMEP\OpenMEP\OpenMEPRevit\ClassModel\GridItem.cs(11,43): warning CS8602: Dereference of a possibly null reference. [D:\a\OpenMEP\OpenMEP\OpenMEPRevit\OpenMEPRevit.csproj]

D:\a\OpenMEP\OpenMEP\OpenMEPRevit\ClassModel\GridItem.cs(20,23): warning CS8602: Dereference of a possibly null reference. [D:\a\OpenMEP\OpenMEP\OpenMEPRevit\OpenMEPRevit.csproj]

D:\a\OpenMEP\OpenMEP\OpenMEPRevit\Element\WallOpening.cs(117,20): warning CS8603: Possible null reference return. [D:\a\OpenMEP\OpenMEP\OpenMEPRevit\OpenMEPRevit.csproj]

D:\a\OpenMEP\OpenMEP\OpenMEPRevit\Element\Element.cs(114,31): warning CS8602: Dereference of a possibly null reference. [D:\a\OpenMEP\OpenMEP\OpenMEPRevit\OpenMEPRevit.csproj]

D:\a\OpenMEP\OpenMEP\OpenMEPRevit\Element\Element.cs(127,31): warning CS8602: Dereference of a possibly null reference. [D:\a\OpenMEP\OpenMEP\OpenMEPRevit\OpenMEPRevit.csproj]

D:\a\OpenMEP\OpenMEP\OpenMEPRevit\Element\Element.cs(141,31): warning CS8602: Dereference of a possibly null reference. [D:\a\OpenMEP\OpenMEP\OpenMEPRevit\OpenMEPRevit.csproj]

D:\a\OpenMEP\OpenMEP\OpenMEPRevit\Element\Element.cs(154,31): warning CS8602: Dereference of a possibly null reference. [D:\a\OpenMEP\OpenMEP\OpenMEPRevit\OpenMEPRevit.csproj]

D:\a\OpenMEP\OpenMEP\OpenMEPRevit\Element\Duct.cs(598,59): warning CS8629: Nullable value type may be null. [D:\a\OpenMEP\OpenMEP\OpenMEPRevit\OpenMEPRevit.csproj]

D:\a\OpenMEP\OpenMEP\OpenMEPRevit\Element\Element.cs(208,31): warning CS8602: Dereference of a possibly null reference. [D:\a\OpenMEP\OpenMEP\OpenMEPRevit\OpenMEPRevit.csproj]