Error on activation

Is there a chance you are already using code from Gravity Wiz in your theme?

This plugin is based of the work from https://gravitywiz.com/better-inventory-with-gravity-forms/

If you have added that code to your functions.php file, then you’ll create a class conflict like you currently have.

I’ll rename the class to avoid any future conflicts and get an update in place later today.

I’ve just checked in a new version that should avoid any naming conflicts.

It’s still recommended to remove the older code from your functions.php file as it may have unintended consequences on some of your forms.