Exception occurred when constructing documentation

[weixing02]

When i follow the steps provided by the documentation to construct documentation:
http://www.paddlepaddle.org/docs/develop/documentation/zh/dev/write_docs_cn.html#id5

cd TO_YOUR_PADDLE_CLONE_PATH
mkdir -p build
cd build
cmake .. -DCMAKE_BUILD_TYPE=Debug -DWITH_GPU=OFF -DWITH_MKL=OFF -DWITH_DOC=ON
make gen_proto_py
make paddle_docs paddle_docs_cn

When I perform the last step:make paddle_docs paddle_docs_cn

Exception occurred as follow:

Exception occurred:
  File "/usr/local/lib/python2.7/dist-packages/recommonmark/states.py", line 134, in run_role
    content=content)
TypeError: 'NoneType' object is not callable
The full traceback has been saved in /tmp/sphinx-err-SkZanJ.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!
doc/v2/CMakeFiles/paddle_docs_cn.dir/build.make:57: recipe for target 'doc/v2/CMakeFiles/paddle_docs_cn' failed
make[3]: *** [doc/v2/CMakeFiles/paddle_docs_cn] Error 2
CMakeFiles/Makefile2:19760: recipe for target 'doc/v2/CMakeFiles/paddle_docs_cn.dir/all' failed
make[2]: *** [doc/v2/CMakeFiles/paddle_docs_cn.dir/all] Error 2
CMakeFiles/Makefile2:19772: recipe for target 'doc/v2/CMakeFiles/paddle_docs_cn.dir/rule' failed
make[1]: *** [doc/v2/CMakeFiles/paddle_docs_cn.dir/rule] Error 2
Makefile:3837: recipe for target 'paddle_docs_cn' failed
make: *** [paddle_docs_cn] Error 2

Then @luotao1 figured out that the version of sphinx may cause this problem since my version of sphinx is 1.7.1 and i reinstalled sphinx by the version of 1.5.6, problem solved, thanks to @luotao1

[luotao1]

The reason is that our paddle:latest-dev image has wrong sphinx version.

Paddle/Dockerfile

Line 58 in 44e3015

pip install -U docopt PyYAML sphinx && \

@ranqiu92 If set the right version of sphinx, https://github.com/PaddlePaddle/PaddlePaddle.org/issues/442 may be fixed.