KeyError: 'NRTRLabelDecode'

[will9901]

ch_PP-OCRv4_rec & ch_PP-OCRv4_rec_distill.yml,How to solve this error report？
Traceback (most recent call last):
File "tools/train.py", line 227, in
main(config, device, logger, vdl_writer)
File "tools/train.py", line 135, in main
model = build_model(config['Architecture'])
File "D:\PaddleOCR-release-2.7\ppocr\modeling\architectures_init_.py", line 34, in build_model
arch = getattr(mod, name)(config)
File "D:\PaddleOCR-release-2.7\ppocr\modeling\architectures\distillation_model.py", line 47, in init
model = BaseModel(model_config)
File "D:\PaddleOCR-release-2.7\ppocr\modeling\architectures\base_model.py", line 76, in init
self.head = build_head(config["Head"])
File "D:\PaddleOCR-release-2.7\ppocr\modeling\heads_init_.py", line 71, in build_head
module_class = eval(module_name)(**config)
File "D:\PaddleOCR-release-2.7\ppocr\modeling\heads\rec_multi_head.py", line 75, in init
out_channels=out_channels_list['NRTRLabelDecode'] )
KeyError: 'NRTRLabelDecode'