Not able to install packages in Pycharm

Question

I have pycharm community edition(latest stable build) installed on my Ubuntu 16.04 LTS, I am not able to install packages via pycharm, was able to install them before. I can install the packages via pip, but would like to solve this issue.

Below is the Screenshot of the problem

Have googled for this issue, but could not find any fix, I have a windows machine and it does not face the same issue.

Answer 1

I have got a solution, i reffered to https://youtrack.jetbrains.com/issue/PY-20081#u=1468410176856.

Here they have tried to add https://pypi.python.org/pypi as a repository.

To add it as a repository,

1.) Go to Settings
2.) Project interpreter
3.) Click the + sign on top right edge
4.) Go to manage repositories, 
5.) Press the + Sign, then add https://pypi.python.org/pypi
6.) Press Ok

Now all the packages should load.

Thanks Hami Torun & Simon, I was able to solve it by luck.

Answer 2

I had the same issue. It happened suddenly, day ago I was able to perform pip or install packages but on the next day error appeared. However this helped (I used version PyCharm Community Edition 2018):

Go to Settings -> Project Interpreter -> click green "+" icon (on right) -> Manage Repositories (on bottom) -> delete https://pypi.python.org/simple -> add https://pypi.python.org/pypi then click Ok. Repo will be back again as /simple, but don't worry, error should disappear and you should be able to install packages again.