onnx conversion error

[ZXW-King]

Use your pytorch2onnx.py to convert onnx and the error is as follows：
File "/media/xin/work1/github_pro/BHRL/mmdet/models/detectors/base.py", line 168, in forward
return self.onnx_export(img[0], img_metas[0])
File "/media/xin/work1/github_pro/BHRL/mmdet/models/detectors/two_stage.py", line 194, in onnx_export
x = self.extract_feat(img)
File "/media/xin/work1/github_pro/BHRL/mmdet/models/detectors/bhrl.py", line 49, in extract_feat
rf_feat = img[1]
IndexError: index 1 is out of bounds for dimension 0 with size 1
Please give me an answer, thank you