Not able to understand why getting error

Course Q&A Deep Learning Specialization Improving Deep Neural Networks: Hyperparameter tun
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Maybe see also this link tf.keras.losses.BinaryCrossentropy  |  TensorFlow Core v2.8.0

Which contains this key passage:

  • y_pred (predicted value): This is the model’s prediction, i.e, a single floating-point value which either represents a logit, (i.e, value in [-inf, inf] when from_logits=True ) or a probability (i.e, value in [0., 1.] when from_logits=False ).

The network can output either a value in range [-inf, inf] or [0., 1.] (depending on the activation used as @balaji.ambresh correctly shows above.) The loss function needs to know which it is in order to properly interpret the forward prop outputs. from_logits is used to keep the network and the loss function in synch.