Distributed 1.21.8 requires msgpack, which is not installed

I face same issue while installing dask Later I resolved it using either of these two methods.

First Method: Run this command

conda install -c anaconda msgpack-python

Second Method: Run this command

pip install msgpack

python anaconda plotly msgpack

For Windows users who have stumbled upon this thread:

Run Anaconda Prompt as Administrator and enter the following:

pip install msgpack

python anaconda plotly msgpack

To answer your multiple questions

"distributed 1.21.8 requires msgpack" This error has nothing to do with plotly installation. Its due to the way anaconda is installed
The error will not affect installation/upgrades of any of the packages.
"pip install msgpack does not fix the problem" .It will not fix until you try to install msgpack with user admin(Windows) / root(linux) right.I got this fixed on my Windows 10 & Lubuntu 16 with above mentioned solution

CodeHunter