Keras: Error while training the model

While running a Keras model have encountered an error like the below

Solution: 

Keras expects y-data in (N, 17) shape, not (N,) as have probably provided, that's why it raises an error.

class_index_one_hot = keras.utils.to_categorical(class_index, 17)

Output Ex: class_index_one_hot: [0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 1.]

y_train shape: (911, 17)
y_test shape: (449, 17)

Reference:

https://stackoverflow.com/questions/49392972/error-when-checking-target-expected-dense-3-to-have-shape-3-but-got-array-wi