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Hello @amysimpson
We recently upgrade the FluentForms framework and added more symmetric hooks. So the old hook fluentform_form_element_start needs to be replaced with fluentform/form_element_start
Maybe you are using a custom snippet to do something programmatically. Please note that, the old hook will still work but will show deprecation notice if you have WP_DEBUG value enabled.
I think your wp-config.php the WP_DEBUG debug value is true.
It should be
define( ‘WP_DEBUG’, false );
Please note that, we recommend to find the old hook and replace with the new one.