Error during model fit

Train the model

start_time = time.time() # Start time
history = cnn_model.fit(
train_generator,
steps_per_epoch=train_generator.samples // BATCH_SIZE,
epochs=EPOCHS,
validation_data=test_generator,
validation_steps=test_generator.samples // BATCH_SIZE
)
end_time = time.time() # End time
training_time = end_time - start_time

Error produced:
(DEBUG INFO) Executor start aborting (this does not indicate an error and you can ignore this message): INVALID_ARGUMENT: You must feed a value for placeholder tensor ‘Placeholder/_0’ with dtype int32
[[{{node Placeholder/_0}}]]
Epoch 1/10
OMP: Error #34: System unable to allocate necessary resources for OMP thread:
OMP: System error #11: Resource temporarily unavailable
OMP: Hint Try decreasing the value of OMP_NUM_THREADS.

Please confirm which week / assignment your snippet belongs to.