Cannot make a new Express site using install.php: Error: Call to undefined function libraries_get_path() in cu_slider_init()

[zrhoffman]

Describe the bug In the "Install profile" step on the install.php page, I get the following error:

The installation has encountered an error.
Please continue to the error page
An AJAX HTTP error occurred. HTTP Result Code: 500 Debugging information follows. Path: http://from-web.express.io/install.php?profile=express&locale=en&id=1&op=do StatusText: Service unavailable (with message) ResponseText: Error: Call to undefined function libraries_get_path() in cu_slider_init() (line 38 of /app/web/profiles/express/modules/features/cu_slider/cu_slider.module).

Related to #3055

To Reproduce

1. Get and start a web environment. I am using Docker: PHP 7.3 FPM (Alpine base image) with Nginx 1.15 as a web server and MySQL 5.7 for persistent storage.
2. Add Drupal 7 to the web root (using core version 7.66).
3. Add the Express profile from github.com/CuBoulder/express, dev branch (tested with HEAD at fb3ab43fec).
4. Go to from-web.express.io (this should resolve to your web host, e.g., 127.0.0.1), choose Express profile and English language, enter database credentials, and continue.
5. Wait a few seconds, then see error

Expected behavior The "Install profile" step should complete without errors.

Screenshots

Desktop:

• OS: Arch Linux with 5.0.9 kernel
• Browser: Firefox 68 nightly (Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0)

Additional context A batch install from drush (version 8) works fine:

drush site:install --yes --db-url=mysql://user:pass@db-host/db-name express express_profile_configure_form.express_core_version=cu_core

[jwfuller]

Thanks for the report, we fixed it here https://github.com/CuBoulder/express_mono/pull/88