This error is generated since version 8.1 with the change to the 'Roselyn' compiler.
The 'My' namespace is an automatically generated namespace for easy use of functions based on your own project (computer data, environment information, etc.). My is an alias and points to the namespace
Microsoft.VisualBasic.Devices.
All client scripts must be checked, and the methods must be converted to the corresponding correct namespace.
Ex:
My.Computer.FileSystem.DirectoryExists(export_path) => System.IO.Directory.Exists(export_path)
My.Computer.FileSystem.CurrentDirectory => Microsoft.VisualBasic.FileIO.CurrentDirectory or System.Environment.CurrentDirectory