Nb_conda installation failed

I have installed Anaconda and created torch’s virtual environment.However, the package “nb_conda_kernels” installed failed(I had installed nb_conda successfully a few days ago,but for some reasons,I uninstalled Anaconda. When I installed nb_conda today,it occurred error.The error is as follows.)

I searched the Internet for a solution,but it didn’t work.I also reinstalled Anaconda,it still didn’t work.
What should I do?