joomla migration 1.5 to 2.5 error undifined-Collection of common programming errors

I’ve try to migrate a website in Joomla from 1.5 to 2.5 using jUpgrade but I’ve receive the “undefined migrating” error.

Here’s the error when I enable the debug:

==========
[checks]

1

==========
[cleanup]

1

==========
[decompress]

1

==========
[install_config]

1

==========
[install_db]



==========
[1] [users]



==========
[2] [categories]

.

==========
[3] [content]



==========
[undefined] [undefined]



==========
[undefined] [undefined]



==========
[undefined] [undefined]

It seems that it cannot go through the menu migration. I’d tried to empty the menu table but the same error occurs.