I am having the same issue.
Tried to import my real export file, and it just says, “unable to import.”
Then I used the sample code referenced in the User Guide (taking out the extra fields, leaving only the body) and the error says, “File contains no exported MT entries.”
For clarification, this is the test file I tried to import:
TITLE: A simple title
AUTHOR: Doctor Suess
DATE: 02/28/1979 12:17:05 AM
PRIMARY CATEGORY: Books
CATEGORY: Children
-----
BODY:
This is the body text.
-----EE version is 1.6.7 20090515.
Permissions on the test file are 777.
Mod: Split from here