densent训练出错

[growvv]

当我执行下面这句话时
res = model.fit_generator(cc1,
steps_per_epoch =3279601// batch_size,
epochs = 100,
validation_data =cc2 ,
validation_steps = 364400// batch_size,
callbacks =[earlystop,checkpoint,tensorboard],
verbose=1
)
出现如下错误：
Epoch 1/100

StopIteration Traceback (most recent call last)
in ()
4 validation_data =cc2 ,
5 validation_steps = 364400// batch_size,
----> 6 callbacks =[earlystop,checkpoint,tensorboard]
7 )

2 frames
/usr/local/lib/python3.6/dist-packages/keras/engine/training_generator.py in fit_generator(model, generator, steps_per_epoch, epochs, verbose, callbacks, validation_data, validation_steps, class_weight, max_queue_size, workers, use_multiprocessing, shuffle, initial_epoch)
179 batch_index = 0
180 while steps_done < steps_per_epoch:
--> 181 generator_output = next(output_generator)
182
183 if not hasattr(generator_output, 'len'):

StopIteration:
请问，这个要如何解决？