@dshank, You have older unsupported version of URE Pro – 4.51.2, which had the bug, caused syntax error:

[07-Aug-2023 04:22:24 UTC] PHP Fatal error: Uncaught TypeError: Unsupported operand types: string + string in /public_html/wp-content/plugins/user-role-editor-pro/pro/includes/classes/other-roles.php:258

It was found at have fixed at version 4.57.

I fixed this bug at your stage server, but recommend to update to the latest version of URE Pro, if you plan to use it.