Tensorflow error when training denoising AE with validation data

[fdavidcl]

ValueError: Output of generator should be a tuple `(x, y, sample_weight)` or `(x, y)`. Found: [array([[0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0],