The same as mentioned in issues/3
New project
Drop a TVirtualExplorerTreeview on the main form
Change the Active property to TRUE
AV
looks like the Error comes from here
FreeAndNil(Data.ColumnManager);
All needed Packages are using from here and not from the GetIt Packager
Delphi Berlin 10.1
The same as mentioned in issues/3 New project Drop a TVirtualExplorerTreeview on the main form Change the Active property to TRUE AV looks like the Error comes from here FreeAndNil(Data.ColumnManager); All needed Packages are using from here and not from the GetIt Packager Delphi Berlin 10.1
Maybe the (Data) Object are nil???