was unable to communicate ocra

Hi Everyone,

I am using plotly. When I am using plotly 
fig.write_image(img, width=1920, height=1440)

 I am getting error like:

 For some reason was unable to communicate with the

local orca server process, even though the server process seems to be running.

Please review the process and connection information below:

orca status

state: running
executable: /usr/bin/xvfb-run --auto-servernum --server-args -screen 0 640x480x24 +extension RANDR +extension GLX /root/.nvm/versions/node/v10.1.0/bin/orca
version: 1.2.1
port: 45043
pid: 2471
command: ['/usr/bin/xvfb-run', '--auto-servernum', '--server-args', '-screen 0 640x480x24 +extension RANDR +extension GLX', '/root/.nvm/versions/node/v10.1.0/bin/orca', 'serve', '-p', '45043', '--plotly', '/root/cuantafy_generator/venv/lib/python3.6/site-packages/plotly/package_data/plotly.min.js', '--graph-only', '--mathjax', '', '--mapbox-access-token', 'map-key']

I am already tested this is there any other solution, I can implement.