how to let the interpreter pointing to the virtual environment having been created under Anconda

I have created a virtual environment, i.e., tensorflow, under Anaconda. Within this virtual environment, I have installed all the packages that I need for my project. At present, I also install Pycharm. For a given project, e.g., testPycharmAnaconda,to be developed under PyCharm, how to setup the interpreter so that this project will use the virtual environment tensorflow having been installed in Anaconda.

I went to the interpreter setting page, and choose the option of conda environment, then I choose interpreter as follows, but I got the following error message, How to fix it? Thanks.