Ghost 502 error & lodash error

My site, highgravityconsulting.com, is getting a 502 error. This site has been up and running for a couple years and other than system upgrades (I have them set to occur automatically), I haven’t touched it. No config settings changes at all and suddenly, its just not working.

When I go into my ghost directory and try to manually start ghost, I get this error:

ERROR: Cannot find module 'lodash/object/assign'

 Error: Cannot find module 'lodash/object/assign'
    at Function.Module._resolveFilename (module.js:336:15)
    at Function.Module._load (module.js:278:25)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Object.<anonymous> (/var/www/ghost/node_modules/knex/lib/raw.js:8:14)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Object.<anonymous> (/var/www/ghost/node_modules/knex/lib/index.js:3:11)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Object.<anonymous> (/var/www/ghost/node_modules/knex/knex.js:8:18)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)

I tried to reinstall lodash but get the same problem. Anyone have suggestions?