Importing pst files into eM, error mesage " Object reference not set to an instance of an object". How do I get around it?

There was exactly the same problem reported 4 months back, but no reply.

https://forum.emclient.com/emclient/topics/pst-import-fails-object-reference-not-set

If you have a Pro License, it might be an idea to open a support ticket for this.