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Error: Tried to use Sage's Python which was not yet installed.

I get the following error when I try to run Sage.

  $ sage
  Error: Tried to use Sage's Python which was not yet installed.
  If this was called from an spkg-install script for another package you should add $(PYTHON) as a dependency in build/pkgs/<pkg>/dependencies

I am using MAC. I did install both Python2 and Python3. I also upgraded my python to latest versions using

  $ brew upgrade python@3
  $ brew upgrade python@2

I do not understand the problem. Please help me.