Loading UPK Training Materials into OLM

Hi,

I am starting to load training materials into our OLM Content Server. One of the types of training materials is from UPK. I am able to upload the training material in OLM, however I am getting the following error.

Analysis started at Jun 5, 2012 3:07:37 PM.
The operation could not find a learning object with the external identifier:  and external source: . A new learning object named Learning Management Tree with id 45018 has been created.

The operation could not find a learning object with the external identifier:  and external source: . A new learning object named Instructor Self-Service with id 45019 has been created.