The BerkeleyDB to SQLite conversion fails part-way through (at category #14) with An error occurred while loading data: (that's all).

I edited mt.cfg like in Converting your Berkeley DB to a SQL database:

CODE
DataSource /Users/me/Sites/movabletype/db
ObjectDriver DBI::sqlite
Database sqlite/db


I ran the mt-db2sql.cgi script:

CODE
Loading database schema...

Loading data...
MT::Author
    1
    2

MT::Blog
    1
    2
    3
    4

MT::Category
    1
    10
    11
    12
    13
    14

An error occurred while loading data:


...and that's all. I deleted sqlite/db and tried again and it stopped at the same place.

Any ideas? Thanks very much for any help. Sam