When i want to export my retrained deeplabv3plus model by export_model.py supported by official, i have a difficult problem,please help me!

When i want to export my retrained model by export_model.py supported by office, i have a difficult problem,please help me!
I run this shell:

python export_model.py \
  --checkpoint_path="/home/administrator/diskc/GuanChao/graduationProject/deeplab/deeplabv3+/models/research/deeplab/exp/xception_65_10/train/model.ckpt-10" \
  --export_path="home/administrator/diskc/GuanChao/graduationProject/deeplab/deeplabv3+/models/research/deeplab/output_model/cityscapes/frozen_inference_graph.pb" \
  --model_variant="xception_65" \
  --atrous_rates=6 \
  --atrous_rates=12 \
  --atrous_rates=18 \
  --output_stride=16 \
  --decoder_output_stride=4 \
  --num_classes=21 \
  --crop_size=513 \
  --crop_size=513 \
  --inference_scales=1.0

and  the recall by terminal:
Traceback (most recent call last):
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1327, in _do_call
    return fn(*args)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1312, in _run_fn
    options, feed_dict, fetch_list, target_list, run_metadata)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1420, in _call_tf_sessionrun
    status, run_metadata)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/framework/errors_impl.py", line 516, in __exit__
    c_api.TF_GetCode(self.status.status))
tensorflow.python.framework.errors_impl.InvalidArgumentError: Assign requires shapes of both tensors to match. lhs shape= [1,1,256,21] rhs shape= [1,1,256,19]
	 [[Node: save/Assign_71 = Assign[T=DT_FLOAT, _class=["loc:@logits/semantic/weights"], use_locking=true, validate_shape=true, _device="/job:localhost/replica:0/task:0/device:GPU:0"](logits/semantic/weights, save/RestoreV2/_3)]]

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "export_model.py", line 169, in <module>
    tf.app.run()
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/platform/app.py", line 126, in run
    _sys.exit(main(argv))
  File "export_model.py", line 163, in main
    initializer_nodes=None)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/tools/freeze_graph.py", line 106, in freeze_graph_with_def_protos
    saver.restore(sess, input_checkpoint)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/training/saver.py", line 1775, in restore
    {self.saver_def.filename_tensor_name: save_path})
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 905, in run
    run_metadata_ptr)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1140, in _run
    feed_dict_tensor, options, run_metadata)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1321, in _do_run
    run_metadata)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1340, in _do_call
    raise type(e)(node_def, op, message)
tensorflow.python.framework.errors_impl.InvalidArgumentError: Assign requires shapes of both tensors to match. lhs shape= [1,1,256,21] rhs shape= [1,1,256,19]
	 [[Node: save/Assign_71 = Assign[T=DT_FLOAT, _class=["loc:@logits/semantic/weights"], use_locking=true, validate_shape=true, _device="/job:localhost/replica:0/task:0/device:GPU:0"](logits/semantic/weights, save/RestoreV2/_3)]]

Caused by op 'save/Assign_71', defined at:
  File "export_model.py", line 169, in <module>
    tf.app.run()
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/platform/app.py", line 126, in run
    _sys.exit(main(argv))
  File "export_model.py", line 151, in main
    saver = tf.train.Saver(tf.model_variables())
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/training/saver.py", line 1311, in __init__
    self.build()
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/training/saver.py", line 1320, in build
    self._build(self._filename, build_save=True, build_restore=True)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/training/saver.py", line 1357, in _build
    build_save=build_save, build_restore=build_restore)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/training/saver.py", line 809, in _build_internal
    restore_sequentially, reshape)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/training/saver.py", line 470, in _AddRestoreOps
    assign_ops.append(saveable.restore(saveable_tensors, shapes))
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/training/saver.py", line 162, in restore
    self.op.get_shape().is_fully_defined())
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/ops/state_ops.py", line 281, in assign
    validate_shape=validate_shape)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/ops/gen_state_ops.py", line 61, in assign
    use_locking=use_locking, name=name)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/framework/op_def_library.py", line 787, in _apply_op_helper
    op_def=op_def)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/framework/ops.py", line 3290, in create_op
    op_def=op_def)
  File "/home/administrator/anaconda3/envs/fastai/lib/python3.6/site-packages/tensorflow/python/framework/ops.py", line 1654, in __init__
    self._traceback = self._graph._extract_stack()  # pylint: disable=protected-access

InvalidArgumentError (see above for traceback): Assign requires shapes of both tensors to match. lhs shape= [1,1,256,21] rhs shape= [1,1,256,19]
	 [[Node: save/Assign_71 = Assign[T=DT_FLOAT, _class=["loc:@logits/semantic/weights"], use_locking=true, validate_shape=true, _device="/job:localhost/replica:0/task:0/device:GPU:0"](logits/semantic/weights, save/RestoreV2/_3)]]