App not setup: This app is still in development mode

STEP 1:

In Settings -> Basic -> Contact Email. (Give your/any email)

STEP 2: in 'App Review' Tab : change

Do you want to make this app and all its live features available to the general public? Yes

And cheers ..

make sure your app is live on developer.facebook.com

This green circle is indicating the app is live enter image description here

If it is not then follow this two steps for make your app live

Step 1 Go to your application -> setting => and add Contact Email and apply save Changes

Setp 2 Then goto App Review option and make sure this toggle is Yes i added a screen shot

enter image description here

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