[libprotobuf ERROR google/protobuf/descriptor_database.cc.57] , if when I import caffe with openCV

[Sanggeun-Ahn]

Hello. I have a problem with libprotobuf error.

I was following fast-rcnn by s-gupta (https://github.com/s-gupta/fast-rcnn) .
I tested the project , and it returned error like below.

[libprotobuf ERROR google/protobuf/descriptor_database.cc:57] File already exists in database: caffe.proto
[libprotobuf FATAL google/protobuf/descriptor.cc:954] CHECK failed: generated_database_->Add(encoded_file_descriptor, size):
terminate called after throwing an instance of 'google::protobuf::FatalException'
what(): CHECK failed: generated_database_->Add(encoded_file_descriptor, size):
Aborted (core dumped)

I found I couldn't use caffe with cv2 on my PC.

If I import only caffe without cv2, it worked.
and, if I import only cv2 without caffe, it worked too.

However, If I tried to import caffe after importing cv2, it returned error.

---

Python 2.7.6 (default, Jun 22 2015, 17:58:13)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.

import caffe

---

Python 2.7.6 (default, Jun 22 2015, 17:58:13)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.

import cv2

Python 2.7.6 (default, Jun 22 2015, 17:58:13)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.

import cv2
import caffe
[libprotobuf ERROR google/protobuf/descriptor_database.cc:57] File already exists in database: caffe.proto
[libprotobuf FATAL google/protobuf/descriptor.cc:954] CHECK failed: generated_database_->Add(encoded_file_descriptor, size):
terminate called after throwing an instance of 'google::protobuf::FatalException'
what(): CHECK failed: generated_database_->Add(encoded_file_descriptor, size):
Aborted (core dumped)

---

In order to fix this problem, I searched the error on google .
And I followed some answers . But, I couldn't solve my problem.

Please help me. thank you

[cepiross]

If you are using contrib packages in opencv, it would include dnn module, which causes your symptom. Try to exclude dnn module in contrib, or not to use contrib packages. (#1917)
The conflict will be resolved :)