I upgraded my version of node.
Error: The module '[...]/node_modules/node-expat/build/Release/node_expat.node'
was compiled against a different Node.js version using
NODE_MODULE_VERSION 46. This version of Node.js requires
NODE_MODULE_VERSION 51. Please try re-compiling or re-installing
Node recently released version 7.7, and very soon after discovered that there was a bug in it that prevented all native modules from being compiled.
Shortly they released a patch, v7.7.1, which should fix that issue. I'm guessing you upgraded to 7.7, so updating your install to 7.7.1 should solve this for ya.