tox-conda: cowardly refusing to delete `envdir` (it does not look like a virtualenv)

I got this error when using tox-conda 0.2.0 with tox 3.13.2, on miniconda3 with conda 4.6.14, when an environment exists and needs to be recreated:

(tools_py37) C:\_dev\python_ws\_Libs_OpenSource\py-make>tox -r
GLOB sdist-make: C:\_dev\python_ws\_Libs_OpenSource\py-make\setup.py
py26 create: C:\_dev\python_ws\_Libs_OpenSource\py-make\.tox\py26
ERROR: cowardly refusing to delete `envdir` (it does not look like a virtualenv): C:\_dev\python_ws\_Libs_OpenSource\py-make\.tox\py26

Note that even using tox -r does not solve the problem.

Any idea why this happens ? Thanks for this project !