Hmm, yes I am using version 3.0.3 with WordPress 6.6.2. The log for the error indicates that it originates at line 1204 of bible-reading-plans-class.inc.php:
$language_name = $this->dbp_versions[$this->lng_code_iso][0]['language_name'];
Is it possible that $this->dbp_versions[$this->lng_code_iso][0] is returning a string rather than an array? I’m not sure how to troubleshoot it but it definitely works in PHP 7.4 but not in 8 for me.
