failed + sphinx-build-3 docs html

• sphinx-build-3 docs html Running Sphinx v1.8.4 making output directory... building [mo]: targets for 0 po files that are out of date building [html]: targets for 8 source files that are out of date updating environment: 8 added, 0 changed, 0 removed reading sources... [100%] session
  WARNING: autodoc: failed to import module 'session' from module 'netssh2'; the following exception was raised: /usr/lib64/python3.7/site-packages/ssh2/channel.cpython-37m-x86_64-linux-gnu.so: undefined symbol: libssh2_channel_request_auth_agent looking for now-outdated files... none found pickling environment... done checking consistency... done preparing documents... done writing output... [100%] session
  generating indices... genindex py-modindex writing additional pages... search copying static files... done copying extra files... done dumping search index in English (code: en) ... done dumping object inventory... done build succeeded, 1 warning.