Initial reaction : Looks like you have written/typed the name of your line item Bonus % in your formula. Can you just refer and click on the line item Bonus % . I think it needs to be in single quotes as it contains a special character %.
If you look at your formula your module name is EMP03 Employee Drivers by Role which is the correct name but in your screenshot name of the module is EMP03 Employee Drivers by Dept & Role. Change the name of your module to EMP03 Employee Drivers by Role and your formula should work.