Error: Cannot find module 'node-sass'

[fveauvy]

Hello,

I got an issue while following the fast deploy app way.
When I press "Deploy app" I have an issue preventing me to push the app.
Below the log from Heroku :

-----> Node.js app detected
-----> Creating runtime environment
NPM_CONFIG_LOGLEVEL=error
NODE_ENV=production
NODE_MODULES_CACHE=true
NODE_VERBOSE=false

-----> Installing binaries

   engines.node (package.json):  8.0
   engines.npm (package.json):   unspecified (use default)      

   Resolving node version 8.0...
   Downloading and installing node 8.0.0...
   Using default npm version: 5.0.0       

-----> Installing dependencies

   Installing node modules (package.json + package-lock)      

   > [email protected] install /tmp/build_f056e31c2aa6ecaed805119a8dc0b32f/node_modules/node-sass
   > node scripts/install.js       

   module.js:487
       throw err;
       ^       

   Error: Cannot find module 'sshpk'

       at Function.Module._resolveFilename (module.js:485:15)
       at Function.Module._load (module.js:437:25)
       at Module.require (module.js:513:17)
       at require (internal/module.js:11:18)
       at Object.<anonymous> (/tmp/build_f056e31c2aa6ecaed805119a8dc0b32f/node_modules/request/node_modules/http-signature/lib/utils.js:4:13)
       at Module._compile (module.js:569:30)
       at Object.Module._extensions..js (module.js:580:10)
       at Module.load (module.js:503:32)
       at tryModuleLoad (module.js:466:12)
       at Function.Module._load (module.js:458:3)       

   > [email protected] install /tmp/build_f056e31c2aa6ecaed805119a8dc0b32f/node_modules/fsevents
   > node install
   > [email protected] postinstall /tmp/build_f056e31c2aa6ecaed805119a8dc0b32f/node_modules/core-js

   > node scripts/postinstall || echo "ignore"       
   added 958 packages in 30.738s       

-----> Build

   Detected both "build" and "heroku-postbuild" scripts
   Running heroku-postbuild       

   > [email protected] heroku-postbuild /tmp/build_f056e31c2aa6ecaed805119a8dc0b32f
   > npm run build              

   > [email protected] build /tmp/build_f056e31c2aa6ecaed805119a8dc0b32f
   > gulp --production      

module.js:487
throw err;
^

Error: Cannot find module 'node-sass'
at Function.Module._resolveFilename (module.js:485:15)
at Function.Module._load (module.js:437:25)
at Module.require (module.js:513:17)
at require (internal/module.js:11:18)
at Object. (/tmp/build_f056e31c2aa6ecaed805119a8dc0b32f/node_modules/gulp-sass/index.js:187:21)
at Module._compile (module.js:569:30)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:503:32)
at tryModuleLoad (module.js:466:12)
at Function.Module._load (module.js:458:3)

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] build: gulp --production
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /tmp/npmcache.yGDAL/_logs/2019-08-21T14_50_18_735Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] heroku-postbuild: npm run build
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] heroku-postbuild script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /tmp/npmcache.yGDAL/_logs/2019-08-21T14_50_18_749Z-debug.log
-----> Build failed

   We're sorry this build is failing! You can troubleshoot common issues here:
   https://devcenter.heroku.com/articles/troubleshooting-node-deploys       

   Some possible problems:       
   - A module may be missing from 'dependencies' in package.json
     https://devcenter.heroku.com/articles/troubleshooting-node-deploys#ensure-you-aren-t-relying-on-untracked-dependencies
 
   Love,
   Heroku

! Push rejected, failed to compile Node.js app.
! Push failed