I’m following this guide:

https://www.openproject.org/open-source/download/manual-installation-guide/

Only that I changed the branch to get the most current release:

git clone https://github.com/opf/openproject-ce.git --branch stable/6 --depth 1

When I get to precompile the assets I get the following error:

ERROR in /home/openproject/openproject-ce/vendored-plugins/openproject-backlogs/frontend/app/openproject-backlogs-app.js
    Module not found: Error: Cannot resolve module 'jquery-ui/ui/jquery-ui.js' in /home/openproject/openproject-ce/vendored-plugins/openproject-backlogs/frontend/app
     @ /home/openproject/openproject-ce/vendored-plugins/openproject-backlogs/frontend/app/openproject-backlogs-app.js 47:0-36

And then a bunch of other errors.
Any help is appreciated

Full command output is:

RAILS_ENV="production" ./bin/rake assets:precompile
$(npm bin)/webpack --config webpack.production.config.js
{"omniauth-openid-connect":"/home/openproject/openproject-ce/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac","omniauth-openid_connect-providers":"/home/openproject/openproject-ce/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid_connect-providers-86f3670e127e","omniauth-saml":"/home/openproject/openproject-ce/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-saml-5559d6b80805","openproject-auth_plugins":"/home/openproject/openproject-ce/vendored-plugins/openproject-auth_plugins","openproject-auth_saml":"/home/openproject/openproject-ce/vendor/bundle/ruby/2.3.0/bundler/gems/openproject-auth_saml-97212abb8378","openproject-pdf_export":"/home/openproject/openproject-ce/vendored-plugins/openproject-pdf_export","openproject-backlogs":"/home/openproject/openproject-ce/vendored-plugins/openproject-backlogs","openproject-costs":"/home/openproject/openproject-ce/vendored-plugins/openproject-costs","openproject-documents":"/home/openproject/openproject-ce/vendored-plugins/openproject-documents","openproject-webhooks":"/home/openproject/openproject-ce/vendored-plugins/openproject-webhooks","openproject-github_integration":"/home/openproject/openproject-ce/vendored-plugins/openproject-github_integration","openproject-global_roles":"/home/openproject/openproject-ce/vendored-plugins/openproject-global_roles","openproject-local_avatars":"/home/openproject/openproject-ce/vendored-plugins/openproject-local_avatars","openproject-meeting":"/home/openproject/openproject-ce/vendored-plugins/openproject-meeting","openproject-my_project_page":"/home/openproject/openproject-ce/vendored-plugins/openproject-my_project_page","openproject-openid_connect":"/home/openproject/openproject-ce/vendored-plugins/openproject-openid_connect","reporting_engine":"/home/openproject/openproject-ce/vendored-plugins/reporting_engine","openproject-reporting":"/home/openproject/openproject-ce/vendored-plugins/openproject-reporting","openproject-themes-dark":"/home/openproject/openproject-ce/vendored-plugins/openproject-themes-dark","openproject-translations":"/home/openproject/openproject-ce/vendor/bundle/ruby/2.3.0/bundler/gems/openproject-translations-da52ff92cdcd","openproject-xls_export":"/home/openproject/openproject-ce/vendored-plugins/openproject-xls_export"}
Applying webpack.optimize plugins for production.
Hash: bf45a797e56f83842994
Version: webpack 1.13.3
Child
    Hash: bf45a797e56f83842994
    Version: webpack 1.13.3
    Time: 43172ms
                                   Asset     Size  Chunks             Chunk Names
    7b9776076d5fceef4993b55c9383dedd.gif  1.85 kB          [emitted]
                 openproject-core-app.js  1.71 MB       0  [emitted]  core-app
                   openproject-global.js  1.48 MB       1  [emitted]  global
                    openproject-costs.js  44.4 kB       2  [emitted]  costs
          openproject-my_project_page.js  8.69 kB       3  [emitted]  my_project_page
                 openproject-backlogs.js  1.02 kB       4  [emitted]  backlogs
                openproject-core-app.css  4.09 kB       0  [emitted]  core-app
                  openproject-global.css  42.2 kB       1  [emitted]  global
     [261] ./components ^((?!\.(test|spec)).)*\.(js|ts|html)$ 16.3 kB {0} [built]
     [262] ./templates \.html$ 1.22 kB {0} [built]
    [1096] /home/openproject/openproject-ce/vendored-plugins/openproject-costs/frontend/app/components ^((?!\.(test|spec)).)*\.(js|ts)$ 425 bytes {2} [built]
    [1097] /home/openproject/openproject-ce/vendored-plugins/openproject-my_project_page/frontend/app/components ^((?!\.(test|spec)).)*\.(js|ts)$ 330 bytes {3} [built]
        + 1112 hidden modules

    ERROR in /home/openproject/openproject-ce/vendored-plugins/openproject-backlogs/frontend/app/openproject-backlogs-app.js
    Module not found: Error: Cannot resolve module 'jquery-ui/ui/jquery-ui.js' in /home/openproject/openproject-ce/vendored-plugins/openproject-backlogs/frontend/app
     @ /home/openproject/openproject-ce/vendored-plugins/openproject-backlogs/frontend/app/openproject-backlogs-app.js 47:0-36