If you run a Cask command and get an error, there are a few things you can try yourself.
First, make sure you have the latest Cask version (Run cask
--version to find out what version you are using). Upgrade Cask and
its dependencies using cask upgrade-cask (avoid upgrading using git
pull or similar).
If the error still occurs, try removing Cask's dependencies. They are
located in ~/.emacs.d/.cask/EMACS-VERSION/bootstrap. Remove that
directory and try again.
Still doesn't work? Create an issue
and we will help you. Please run any command with the options
--verbose and --debug to give us as much information as possible.