About adding the design of experiments

When I add the design of experiments,an error happened.
How can I solve it?
Thanks!(The following shows my version information)

Looks like matplotlib changed, I’ll fix and push a point release.

Thanks!When I try to update the version of Nodeworks to 20.2.0,I found that the error doesn’t exist anymore.

Awesome! I searched the code and did not see any more add_subplot('111')