Settings page throws error: "Class name must be a valid object or a string"

[iamkeir]

Description

When first saving redirect settings (/admin/sprout/settings/redirects), page throws error:
"Class name must be a valid object or a string"

This error persists whenever visiting the redirect settings now.

Error relates to line 3063 in in /var/www/html/craft/vendor/craftcms/cms/src/helpers/Cp.php:
'alwaysShowThumbAlignmentBtns' => $fieldLayout->type::hasThumbs(),

Full stack trace attached: sprout-redirects-error-trace.txt

How to reproduce

1. Install Sprout Redirects
2. Visit settings page in CP
3. Save changes
4. View error

Sprout Version

Lite 5.0.3

Craft Version

Craft Solo 5.8.13.2

Database Type Version

MySQL 8.0.33

[iamkeir]

Just checking in - is this plugin still actively maintained?