Compilation error when deploying my Ember/Rails app - ruby-on-rails

Question

I have a rails 5 ember 2.17 app that was previously being successfully deployed in production. The deployment is done with ember-cli-rails.
During asset compilation I have the following error :
=================================================================================
ENV Summary:
TIME: Mon Jul 08 2019 15:40:33 GMT+0200 (CEST)
TITLE: ember
ARGV:
- /usr/bin/node
- /srv/production/www/placedemarche/releases/20190708133545/marketadmin/node_modules/ember-cli/bin/ember
- build
- --environment
- production
- --output-path
- /srv/production/www/placedemarche/releases/20190708133545/tmp/ember-cli/apps/marketadmin
EXEC_PATH: /usr/bin/node
TMPDIR: /tmp
SHELL: /bin/bash
PATH:
- /srv/production/www/placedemarche/shared/bundle/ruby/2.4.0/bin
- /home/admin/.rvm/gems/ruby-2.4.1/bin
- /home/admin/.rvm/gems/ruby-2.4.1#global/bin
- /home/admin/.rvm/rubies/ruby-2.4.1/bin
- /home/admin/.rvm/bin
- /usr/local/sbin
- /usr/local/bin
- /usr/sbin
- /usr/bin
- /sbin
- /bin
- /usr/games
- /usr/local/games
PLATFORM: linux x64
FREEMEM: 1093439488
TOTALMEM: 3149369344
UPTIME: 16758723
LOADAVG: 0.8134765625,0.71240234375,0.56201171875
CPUS:
- Intel(R) Xeon(R) CPU E5-2650 v4 # 2.20GHz - 2200
- Intel(R) Xeon(R) CPU E5-2650 v4 # 2.20GHz - 2200
- Intel(R) Xeon(R) CPU E5-2650 v4 # 2.20GHz - 2200
- Intel(R) Xeon(R) CPU E5-2650 v4 # 2.20GHz - 2200
- Intel(R) Xeon(R) CPU E5-2650 v4 # 2.20GHz - 2200
- Intel(R) Xeon(R) CPU E5-2650 v4 # 2.20GHz - 2200
ENDIANNESS: LE
VERSIONS:
- ares: 1.10.1-DEV
- http_parser: 2.8.0
- icu: 58.2
- modules: 48
- napi: 3
- node: 6.14.3
- openssl: 1.0.2o
- uv: 1.16.1
- v8: 5.1.281.111
- zlib: 1.2.11
ERROR Summary:
- broccoliBuilderErrorStack: [undefined]
- code: [undefined]
- codeFrame: [undefined]
- errorMessage: Unexpected identifier
- errorType: [undefined]
- location:
- column: [undefined]
- file: [undefined]
- line: [undefined]
- message: Unexpected identifier
- name: SyntaxError
- nodeAnnotation: [undefined]
- nodeName: [undefined]
- originalErrorMessage: [undefined]
- stack: /srv/production/www/placedemarche/releases/20190708133545/marketadmin/node_modules/#embroider/core/src/to-broccoli-plugin.js:18
async build() {
^^^^^
SyntaxError: Unexpected identifier
at createScript (vm.js:56:10)
at Object.runInThisContext (vm.js:97:10)
at Module._compile (module.js:549:28)
at Object.Module._extensions..js (module.js:586:10)
at Module.load (module.js:494:32)
at tryModuleLoad (module.js:453:12)
at Function.Module._load (module.js:445:3)
at Module.require (module.js:504:17)
at require (internal/module.js:20:19)
at Object.<anonymous> (/srv/production/www/placedemarche/releases/20190708133545/marketadmin/node_modules/#embroider/core/src/index.js:9:28)
=================================================================================
I am not sure what's the next step to solve this problem.

Answer 1

I could see in the error log that the build used node 6:
ENV Summary:
VERSIONS:
- node: 6.14.3
Node 6 is not supported anymore. It's LTS supported ended at April 30, 2019. The ember ecosystem drops support for it as well.
Embroider is an experimental build tool for Ember. It's only tested against Node 10 so far.
I would recommend upgrading your build environment to a recent version of node.