Error: Cannot find module 'hardocs/src/buildSidebar'

Running with gitlab-runner 12.3.0 (a8a019e0)
  on docker-auto-scale 72989761
Using Docker executor with image node:9.11.1 ...
Pulling docker image node:9.11.1 ...
Using docker image sha256:3af8a701bb9c8b2ba4ff30670dd5f82dc79636891c46a4153f18816b5565b27e for node:9.11.1 ...
Running on runner-72989761-project-14674572-concurrent-0 via runner-72989761-srm-1570360598-1568b403...
Fetching changes with git depth set to 50...
Initialized empty Git repository in /builds/go-commons/delftopenhardware/webiste/.git/
Created fresh repository.
From https://gitlab.com/go-commons/delftopenhardware/webiste
 * [new branch]      master     -> origin/master
Checking out 6ffedae3 as master...

Skipping Git submodules setup
Checking cache for default...
FATAL: file does not exist                         
Failed to extract cache
$ npm install
npm WARN notice [SECURITY] lodash has the following vulnerabilities: 1 moderate, 1 low. Go here for more details: https://www.npmjs.com/advisories?search=lodash&version=4.16.6 - Run `npm i npm@latest -g` to upgrade your npm version, and then `npm audit` to get more info.

> core-js@2.6.9 postinstall /builds/go-commons/delftopenhardware/webiste/node_modules/core-js
> node scripts/postinstall || echo "ignore"

npm WARN webiste No repository field.
npm WARN The package vuepress is included as both a dev and production dependency.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.9 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.9: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

added 1051 packages in 19.689s
$ npm run build

> @ build /builds/go-commons/delftopenhardware/webiste
> vuepress build docs

wait Extracting site metadata...
Error: Cannot find module 'hardocs/src/buildSidebar'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:548:15)
    at Function.Module._load (internal/modules/cjs/loader.js:475:25)
    at Module.require (internal/modules/cjs/loader.js:598:17)
    at require (internal/modules/cjs/helpers.js:11:18)
    at Object.<anonymous> (/builds/go-commons/delftopenhardware/webiste/docs/.vuepress/config.js:1:84)
    at Module._compile (internal/modules/cjs/loader.js:654:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:665:10)
    at Module.load (internal/modules/cjs/loader.js:566:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:506:12)
    at Function.Module._load (internal/modules/cjs/loader.js:498:3)
    at Module.require (internal/modules/cjs/loader.js:598:17)
    at require (internal/modules/cjs/helpers.js:11:18)
    at loadConfig (/builds/go-commons/delftopenhardware/webiste/node_modules/@vuepress/core/lib/node/loadConfig.js:31:18)
    at App.resolveConfigAndInitialize (/builds/go-commons/delftopenhardware/webiste/node_modules/@vuepress/core/lib/node/App.js:67:24)
    at App.process (/builds/go-commons/delftopenhardware/webiste/node_modules/@vuepress/core/lib/node/App.js:98:10)
    at build (/builds/go-commons/delftopenhardware/webiste/node_modules/@vuepress/core/lib/index.js:20:13)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @ build: `vuepress build docs`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the @ 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!     /root/.npm/_logs/2019-10-06T11_18_29_627Z-debug.log
ERROR: Job failed: exit code 1