...
We have seen problems with this import on a number of systems, notably Windows server 2008. It turned out that on those systems the underlying runtime libraries need several extra DLLs that are not required on other systems (see for instance the page on known problems for the HDF viewer). Installing the .NET 3.5 Service Pack 1
solves this problem (http://download.microsoft.com/download/2/0/e/20e90413-712f-438c-988e-fdaa79a8ac3d/dotnetfx35.exe
)