I have seen similar problems in the past.

I believe it could be that you are not importing the full webpart.
Could it be that the web  part is not working properly or was not
exported properly.

Some webparts not only create a .vbs file but also have a file
folder containing for example gifs. If the web part  is not being
properly imported then you may find the .vbs is imported but the
extra folder is missing hence the error. The thing to remember is
that you cannot recreate an exact replica of a web part within a
different portal. You can only create your own instance of it which
although appearing the same and having the same functionality has
its own attributes. (Objected Oriented). When a web part is created
it has its own unique ID / reference within the portal.

Try crreating a fully working web part in your corporate gallery and
then importing from their. Ensure through the web folder view that
you have every element of the web part as you expect.

If not it may even be worth getting the web part again and ensure
you are working with a non corrupted web part.

I hope this helps or that someone gives a better answer.

Good luck Trev