Python google.protobuf.message.DecodeError: Error parsing message

[Junhao Wen]

When I use the protobuf(3.1.0) on my mac to read the .proto file, I alwats got the error: 

 

 google.protobuf.message.DecodeError: Error parsing message

Here is my code:

f = open('/Users/junhao.wen/Hao/tutorial/Protocol_buffers_tutorial/tutorial/Protocol_buffers_basic_python/address_book/test.proto', 'rb')
address_book.ParseFromString(f.read())

Can you give me a help??

what does that mean?????