caffe_pb2.py has no LabelMap()

hi !
i am trying to use this caffe to do some ssd work
i get a problem when i am tryting to create lmdb data using create_data.bat which is in the caffe-ssd-microsoft, the err is:
```
File "E:\proj\caffe\caffe-windows-ms-ssd\caffe-windows-ms\scripts\create_annoset.py", line 103, in
label_map = caffe_pb2.LabelMap()
AttributeError: 'module' object has no attribute 'LabelMap'
```
i checked caffe_pb2.py and found no LabelMap() in it
i am sure the python path is correct and i think the problem is in my pycaffe
can someone explain how does pycaffe work or just tell me how to fix it