Error when I want Create course in the portal LSO

Dear.

Anyone Know What is the cause of the following error when I want create courses in the portal LSO in the moment of press the button Save

! Course could not be created

! Web-Based Training could not be created.

! External relationship could not be edited (->T77EV)

The Path for reproduce the issue is:

Course Administration >Courses >

Schedule a Course Date

Search in course Catalog--> I select a Course Catalog

Press the button start-->

Ok.

Save

Thanks

Juan.