Build failing for Gatsby Next pages due to missing dependencies

12:14:42 PM: > next build && next export && node exportSitemap.js
12:14:42 PM: lerna
12:14:42 PM: ERR!
12:14:42 PM: npm run build
12:14:42 PM:  stderr:
12:14:42 PM: sh: 1: next: not found
12:14:42 PM: npm ERR! code ELIFECYCLE
12:14:42 PM: npm ERR! syscall spawn
12:14:42 PM: npm ERR! file sh
12:14:42 PM: npm ERR! errno ENOENT
12:14:42 PM: npm ERR! sanity-nextjs-landing-pages-web@1.0.5 build: `next build && next export && node exportSitemap.js`
12:14:42 PM: npm ERR! spawn ENOENT
12:14:42 PM: npm ERR!
12:14:42 PM: npm ERR! Failed at the sanity-nextjs-landing-pages-web@1.0.5 build script.
12:14:42 PM: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
12:14:42 PM: npm WARN Local package.json exists, but node_modules missing, did you mean to install?
12:14:42 PM: npm ERR! A complete log of this run can be found in:
12:14:42 PM: npm ERR!     /opt/buildhome/.npm/_logs/2020-06-01T11_14_42_427Z-debug.log
12:14:42 PM: lerna
12:14:42 PM: ERR!
12:14:42 PM: npm run build
12:14:42 PM:  exited 1 in 'sanity-nextjs-landing-pages-web'
12:14:42 PM: lerna
12:14:42 PM: WARN
12:14:42 PM: complete
12:14:42 PM:  Waiting for 1 child process to exit. CTRL-C to exit immediately.
12:14:42 PM: npm ERR! code ELIFECYCLE
12:14:42 PM: npm ERR! errno 1
12:14:42 PM: npm ERR! sanity-nextjs-landing-pages@1.0.5 build: `lerna run build --parallel`
12:14:42 PM: npm ERR! Exit status 1
12:14:42 PM: npm ERR!
12:14:42 PM: npm ERR! Failed at the sanity-nextjs-landing-pages@1.0.5 build script.
12:14:42 PM: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
12:14:42 PM: npm
12:14:42 PM: ERR!
12:14:42 PM:  A complete log of this run can be found in:
12:14:42 PM: npm
12:14:42 PM: ERR!
12:14:42 PM:      /opt/buildhome/.npm/_logs/2020-06-01T11_14_42_471Z-debug.log
12:14:42 PM:
12:14:42 PM: ┌─────────────────────────────┐
12:14:42 PM: │   "build.command" failed    │
12:14:42 PM: └─────────────────────────────┘
12:14:42 PM:
12:14:42 PM:   Error message
12:14:42 PM:   Command failed with exit code 1: npm run build
12:14:42 PM:
12:14:42 PM:   Error location
12:14:42 PM:   In Build command from settings:
12:14:42 PM:   npm run build
12:14:42 PM:
12:14:42 PM:   Resolved config
12:14:42 PM:   build:
12:14:42 PM:     base: /opt/build/repo
12:14:42 PM:     command: npm run build
12:14:42 PM:     publish: /opt/build/repo/web/out
12:14:42 PM: Caching artifacts
12:14:42 PM: Started saving node modules
12:14:42 PM: Finished saving node modules
12:14:42 PM: Started saving build plugins
12:14:42 PM: Finished saving build plugins
12:14:42 PM: Started saving pip cache
12:14:43 PM: Finished saving pip cache
12:14:43 PM: Started saving emacs cask dependencies
12:14:43 PM: Finished saving emacs cask dependencies
12:14:43 PM: Started saving maven dependencies
12:14:43 PM: Finished saving maven dependencies
12:14:43 PM: Started saving boot dependencies
12:14:43 PM: Finished saving boot dependencies
12:14:43 PM: Started saving go dependencies
12:14:43 PM: Finished saving go dependencies
12:14:43 PM: Error running command: Build script returned non-zero exit code: 1
12:14:43 PM: Failing build: Failed to build site
12:14:43 PM: Failed during stage 'building site': Build script returned non-zero exit code: 1
12:14:43 PM: Finished processing build request in 17.856230569s