I’m sorry to hear that you are facing this problem.
Some possible reasons are as follows:
-> I guess you didn’t buy main plugin “Gravity Form”
This kind of message is shown on the settings tab if gravity integration add-on doesn’t get linked with “Gravity Form” plugin.
-> If you’ve bought the plugin then you may have forgotten to active the plugin.
Please do check the following and let me know if the problem is fixed or not.
We are always here to help you.