I was getting that message too back in July, 2001. I wrote to the fellow who did the interface into e-Smith and he responded "I thought my last modification fixed that but now I know it didn't. It's harmless, just ignore it".
I saved that dialog for some reason but haven't had the error in many months. I'm suspecting he did fix it in a later version. I'm running Version 1.0.0-2 .