In a large skillet, cook chicken over medium heat until no longer pink. Add the celery, green pepper and onion; cook and stir 5 minutes longer or until tender. Stir in the tomatoes, water, tomato paste, Cajun seasoning and sugar. In a small bowl, combine cheeses. , Spread 1 cup meat sauce in a greased oval 5- or 6-qt. slow cooker. Layer with 3 noodles (breaking noodles if necessary to fit), a third of the remaining meat sauce and a third of the cheese mixture. Repeat layers twice. Cook, covered, on low for 3-4 hours or until noodles are tender.