Plugins error with upgrade to 3.82 from 3.56

Hi, Interactive Tools.

I've upgraded several v3.80 to 3.82 and all went very well. Today I tried an upgrade from 3.56 to 3.82 and encountered a plugins error.

When viewing CMS Setup > Plugins, the following error displays (screenshot attached):
---
Required System Plugins
The following errors were encountered while trying to active Required System Plugins:
file_get_contents(/home/zzzweb/public_html/cmszzz/lib/languages/adminMenu/.php): Failed to open stream: No such file or directory in /home/zzzweb/public_html/cmszzz/lib/Struct.php on line 62
---

- I first saw this after the upgrade while the existing plugins were in place, so I updated all plugins and yet the message persisted.
- Removed all plugins and the error went away.
- Uploaded "_example_cron.php plugin" that shipped with 3.82 and saw the error again.
- Re-uploaded the entire software, but the error remains.

The site is running: PHP v8.1.32, MySQL v5.7.36, which worked fine with other upgrades from 3.80.

I have a large batch of v3.56 sites to upgrade, so any tips on what I could check or try would be helpful.

Thank you.
~ Deborah