运行神经网络模型时遇到bug

tensorflow.contrib.labeled_tensor.python.ops._typecheck.Error:
[{‘TRAIN_TUPLE’: FixedLenFeature(shape=[], dtype=tf.string, default_value=None)},
{‘TRAIN_TUPLE’: FixedLenFeature(shape=[], dtype=tf.string, default_value=None)},
{‘TRAIN_TUPLE’: FixedLenFeature(shape=[], dtype=tf.string, default_value=None)},
{‘TRAIN_TUPLE’: FixedLenFeature(shape=[], dtype=tf.string, default_value=None)}]
of type <class ‘list’> is not an instance of the allowed type Collection (Union(labeled_tensor.LabeledTensor, tensorflow.Tensor,numpy.ndarray,Union(numbers.Number, bool, bytes, str)))
for <function pack at 0x00000222C756A598>