Metapedia import error

Hello there,

We are using Information steward version 4.2.

We exported an existing metapedia into an xls file.We added some new categories and terms in the same xls file.When we import this file again using "Import Metapedia from MS excel file" , we get this error

Two questions

1.Where the log file mentioned in the error located?

2.What would be the reason for this error?

Regards,

Magesh