migrate doesnt work

[nauj p. s.]

Hi!

    I'm starting to use Django 1.8 with the firebird backend.

I have created my models.py with inspectdb, so I have the database already created.

Put the primary keys in the models.

When I try to do migrate django crashes with a exception that says conversion error of a string, seems a current date.

Any hit so as not to have this error or a workaround?

Thanks in advance.

Juan