Why is prediction not happening?

Question

Neural networks

I trained the neural network in one file, saved the training result, and then I try to load this result in another file and make a prediction there (using keras). The network was trained on this type of data (in a .csv file):

• 0, 0, 0, 0
  0, 0, 1, 1
  0, 1, 0, 0
  etc
  

The first three values ​​are input and the last is the expected result.
Then in the file in which the prediction I do the following:

x = numpy.array([1, 0, 1])

print(model.predict(x))

But an error occurs:
"Error when checking input: expected dense_1_input to have shape (3,) but got array with shape (1,)"
What is the reason for this? With the wrong type of data that the network accepts, or was it trained incorrectly?