NameError: name 'predicted_labels' is not defined

[hobbyist]

Hello! I am trying to run the code from this tutorial: link-for-the-code

but on this part:

val_image_batch, val_label_batch = next(iter(valid_generator))

tf_model_predictions = model.predict(val_image_batch)
print("Prediction results shape:", tf_model_predictions.shape)
plt.figure(figsize=(10,9))
plt.subplots_adjust(hspace=0.5)
for n in range((len(predicted_labels)-2)): # here is the problem
 plt.subplot(6,5,n+1)
 plt.imshow(val_image_batch[n])
 color = "green" if predicted_ids[n] == true_label_ids[n] else "red"
 plt.title(predicted_labels[n].title(), color=color)
 plt.axis('off')
_ = plt.suptitle("Model predictions (green: correct, red: incorrect)")

I get this error:

Error:
NameError: name 'predicted_labels' is not defined

I am searching all day in order to find a solution via google...Nothing yet!! Has anyone, any idea how to solve it?