学习《Python小白逆袭大神》的课程，第四天作业为对选手进行分类，实践时遇到了下面的报错，在网上搜了，但是没搜到是什么原因，请教各位大神。

 Traceback (most recent call last) in 
      9     feature=feature_map,
     10     num_classes=dataset.num_labels,
---> 11     config=config)
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddlehub/finetune/task/classifier_task.py in __init__(self, feature, num_classes, feed_list, data_reader, startup_program, config, hidden_units, metrics_choices)
     47             startup_program=startup_program,
     48             config=config,
---> 49             metrics_choices=metrics_choices)
     50 
     51         self.feature = feature
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddlehub/finetune/task/base_task.py in __init__(self, feed_list, data_reader, main_program, startup_program, config, metrics_choices)
    231         for hook_type, hooks in self._registered_hooks.items():
    232             already_print_type = False
--> 233             for name, func in hooks.items():
    234                 if name == "default" and not show_default:
    235                     continue
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddlehub/common/paddle_helper.py in clone_program(origin_program, for_test)
    272     dest_program = fluid.Program()
    273     _copy_vars_and_ops_in_blocks(origin_program.global_block(),
--> 274                                  dest_program.global_block())
    275     dest_program = dest_program.clone(for_test=for_test)
    276     if not for_test:
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddlehub/common/paddle_helper.py in _copy_vars_and_ops_in_blocks(from_block, to_block)
    145     for var in from_block.vars:
    146         var = from_block.var(var)
--> 147         var_info = copy.deepcopy(get_variable_info(var))
    148         if isinstance(var, fluid.framework.Parameter):
    149             to_block.create_parameter(**var_info)
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddlehub/common/paddle_helper.py in get_variable_info(var)
     52     var_info = {
     53         'name': var.name,
---> 54         'dtype': convert_dtype_to_string(var.dtype),
     55         'lod_level': var.lod_level,
     56         'shape': var.shape,
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/fluid/framework.py in dtype(self)
   1383             pass
   1384         else:
-> 1385             return self.desc.dtype()
   1386 
   1387     @property
EnforceNotMet:
--------------------------------------------

C++ Call Stacks (More useful to developers):
--------------------------------------------
0 std::string paddle::platform::GetTraceBackString(std::string&&, char const*, int)
1 paddle::framework::VarDesc::tensor_desc() const
2 paddle::framework::VarDesc::GetDataType() const

----------------------
Error Message Summary:
----------------------
Error: Getting 'tensor_desc' is not supported by the type of var create_py_reader_0. at (/paddle/paddle/fluid/framework/var_desc.cc:209)