Correct, because you have no object named rec in the context within the template being rendered.
If you’re trying to reference the same object that you are iterating through in your {% for ... tag, then your reference needs to be to reclamaciones, not rec.
Side note: In the future, please do not post screen images of error messages or code. If you’re trying to pass along information about an error, post the traceback from the console window and not a screen image of your browser window.