vagrant upコマンドを実行したところ、次のようなエラーが出ました。解決方法を教えてください。

A Vagrant environment or target machine is required to run this
command. Run `vagrant init` to create a new Vagrant environment. Or
get an ID of a target machine from `vagrant global-status` to run
this command on. A final option is to change to a directory with a
Vagrantfile and to try again.