Always load GN4 add-ins by opening the solution file GN4AddInsExpress.sln.

Find in the \src\GN4AddIns folder.

Note

You can also use the appropriate version of the Microsoft Visual Studio to edit and compile GN4 add-ins. Even in that case, you need to use GN4AddInsExpress.sln.

See also

Installing add-ins source files

Setting up your workstation to use GN4AddInsExpress.sln