I can't create a Python3 virtualenv



I am trying to create a Python3 virtualenv in a new workspace on an account that hadn’t been used in over two years.

I get an error message when I try to run the following command:
virtualenv -p Python3 venv
The executable Python3 (from --python=Python3) does not exist

If I look in the bin directory of the venv directory it onlly shows Python2.7, Python2 etc…

In the project settings I changed the default Python type to Python3.

If I run virtualenv venv it creates the virtual directory but running python -v shows Python 2.7.

Any help would be greatly appreciated,