docopt.DocoptLanguageError: “usage:“ (case-insensitive) not found.

arguments = docopt(doc) 报错：

docopt.DocoptLanguageError: “usage:” (case-insensitive) not found.
在
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直接添加Usage:，Options:等说明。
例：
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Using multilayer perceptron (MLP) and ensemble learning to classify the ASD and TC based on single brain atlas.
Usage:
nn_evaluate.py [–folds=N] [–whole] [ …]
nn_evaluate.py (-h | --help)
Options:
-h --help Show this screen
–whole Prepare data of the whole dataset
derivative Derivatives to process
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