fluid_to_onnx show error

[phamkhactu]

i don't know what happens and how to solve it

-----------  Configuration Arguments -----------
check_task: image_classification
debug: False
fluid_model: ../mask_detector/
fluid_model_name: __model__
fluid_params_name: __param__
image_path: 
name_prefix: 
onnx_model: ./model.onnx
return_variable: False
to_print_model: False
------------------------------------------------
load the model parameter done.
Traceback (most recent call last):
  File "fluid_to_onnx.py", line 234, in <module>
    main()
  File "fluid_to_onnx.py", line 230, in main
    convert(args)
  File "fluid_to_onnx.py", line 141, in convert
    block=block)
  File "/home/tu/anaconda3/envs/occlusion_face_paddle/lib/python3.7/site-packages/fluid_onnx/ops.py", line 192, in conv2d_op
    kernel_shape = block.vars[get_old_name(inputs['Filter'][0])].shape
KeyError: ''