Warning: file_get_contents(libraries/slick/slick/slick.min.js): Failed to open stream: No such file or directory in _locale_parse_js_file() (line 1097 of core/modules/locale/locale.module).

Thank you.

I don't see Slick module codes in the warning message.

The calling site is local.module.

Looks like it doesn't properly checks for the Slick library folder existence before calling its containing file.

As an example to explain "properly" above, we did check it properly here:
https://git.drupalcode.org/project/slick/-/blob/3.0.3/slick.install?ref_...

Unless the caller is this module,
please report it to core issues instead. This module cannot fix other module's code.

To entertain a bit, warning should be fixed, but it is not qualified as an error, meaning hardly major.

Quick solutions:

• Disable warning reports at production as it should me. Enable logging instead.
• Put the required file until the actual fix, although unnecessary for sure.

Thank you gausarts.