That error message usually appears when Docker is not able to build your image and tries to run it so it seem that PyCharm can connect to Docker but the build failed.
Try this:
First let's see if PyCharm can connect to Docker (by the error you receive I think it does):
Docker connection in PyCharm - Services window
If you can see your images and containers, you're connected to Docker. Let's see if your build fails:
Now the Services window will get focused and show the build status. If it fails, you should see the reason there.
in case you follow the step above and didn't work for you try to check if busybox:latest image if exists, else pull this again from docker hub.
What solved this issue for me was making sure I was logged in on Docker for Mac