Error when change a CharField to IntegerField

[Neto]

I changed a CharField to IntegerField and when I did ./manage.py migrate, appeared the message on terminal:

django.db.utils.ProgrammingError: column "rotulo" cannot be cast automatically to type integer HINT:  Specify a USING expression to perform the conversion.

What is it?

[Jorge Andrés Vergara Ebratt]

Hi, did the column had previus non-integer data in it?

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Jorge Andres Vergara Ebratt

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[Neto]

before was empty, but I deleted the column and remade, thanks