error when submitting form

I am getting the following error when submitting the form. Please advise on what to do. Thank yo in advance for your time & help.

[15-Dec-2022 22:22:27 UTC] PHP Fatal error: Uncaught Error: Call to undefined function ctype_alnum() in /hermes/bosnacweb01/bosnacweb01/bosnacweb01bb/b1011/ipw.moseleymfbiz/public_html/wp-content/plugins/forminator/library/model/class-form-entry-model.php:113
Stack trace:

0 /hermes/bosnacweb01/bosnacweb01/bosnacweb01bb/b1011/ipw.moseleymfbiz/public_html/wp-content/plugins/forminator/library/abstracts/abstract-class-front-action.php(1072): Forminator_Form_Entry_Model->__construct()

1 /hermes/bosnacweb01/bosnacweb01/bosnacweb01bb/b1011/ipw.moseleymfbiz/public_html/wp-content/plugins/forminator/library/modules/custom-forms/front/front-action.php(852): Forminator_Front_Action::get_entry()

2 /hermes/bosnacweb01/bosnacweb01/bosnacweb01bb/b1011/ipw.moseleymfbiz/public_html/wp-content/plugins/forminator/library/abstracts/abstract-class-front-action.php(405): Forminator_CForm_Front_Action->handle_form()

3 /hermes/bosnacweb01/bosnacweb01/bosnacweb01bb/b1011/ipw.moseleymfbiz/public_html/wp-includes/class-wp-hook.php(308): Forminator_Front_Action->save_entry(‘ in /hermes/bosnacweb01/bosnacweb01/bosnacweb01bb/b1011/ipw.moseleymfbiz/public_html/wp-content/plugins/forminator/library/model/class-form-entry-model.php on line 113

The page I need help with: [log in to see the link]