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I fixed this by first uninstalling the vue-cli by running npm uninstall vue-cli -g
then uninstalling my Node.js from the control panel: Then installing the latest current version(not the LTS version) of Node.js then running npm install -g npm
then install the vue-cli again using npm install -g vue-cli
In a nutshell update Node.js and npm to the latest versions then install the vue-cli.
Update: In case you use Ubuntu or any Ubuntu base OS:
First, uninstalling the vue-cli by running sudo npm uninstall vue-cli -g
then uninstall your current version of Node and install the latest version from here (install the build tools as well) then run sudo npm install -g npm
then install the vue-cli again using sudo npm install -g vue-cli
Source:stackexchange.com