rs/roi_align_layer.cpp:30:19: error: expected initializer before ‘<’ token void ROIAlign

[PapaMadeleine2022]

hello, when I compile caffe I get this error:

src/caffe/layers/roi_align_layer.cpp:30:19: error: expected initializer before ‘<’ token
 void ROIAlignLayer<Dtype>::LayerSetUp(const vector<Blob<Dtype>*>& bottom,
                   ^
src/caffe/layers/roi_align_layer.cpp:45:19: error: expected initializer before ‘<’ token
 void ROIAlignLayer<Dtype>::Reshape(const vector<Blob<Dtype>*>& bottom,
                   ^
src/caffe/layers/roi_align_layer.cpp:62:19: error: expected initializer before ‘<’ token
 void ROIAlignLayer<Dtype>::Forward_cpu(const vector<Blob<Dtype>*>& bottom,
                   ^
src/caffe/layers/roi_align_layer.cpp:203:19: error: expected initializer before ‘<’ token
 void ROIAlignLayer<Dtype>::Backward_cpu(const vector<Blob<Dtype>*>& top,
                   ^
In file included from ./include/caffe/blob.hpp:8:0,
                 from src/caffe/layers/roi_align_layer.cpp:15:
src/caffe/layers/roi_align_layer.cpp:261:19: error: ‘ROIAlignLayer’ is not a class template
 INSTANTIATE_CLASS(ROIAlignLayer);

how to fix it?
can you give some advises? thank you very much~