onnx转rknn时报如下错，但是没法定位具体是哪个层或者哪个...

D connect MaxPool_MaxPool_138_29 0  ~ Mul_Mul_144_64 1
D connect Unsqueeze_Unsqueeze_151_82 0  ~ Unsqueeze_Unsqueeze_152_65 0
W Not get any connection of Initializer_73ut0
E Catch exception when loading onnx model: PALM_CDC_128.onnx!
E Traceback (most recent call last):
E   File "rknn/api/rknn_base.py", line 292, in rknn.api.rknn_base.RKNNBase.load_onnx
E   File "rknn/base/RKNNlib/RK_nn.py", line 141, in rknn.base.RKNNlib.RK_nn.RKnn.load_onnx
E   File "rknn/base/RKNNlib/app/importer/import_onnx.py", line 130, in rknn.base.RKNNlib.app.importer.import_onnx.Importonnx.run
E   File "rknn/base/RKNNlib/converter/convert_onnx.py", line 1692, in rknn.base.RKNNlib.converter.convert_onnx.convert_onnx.graph_connection_build
E AttributeError: 'NoneType' object has no attribute 'lid'
Load PALM_CDC failed!