Unable to add Send Email Message action to WFFM form on save action

Hi All,

We are using Sitecore 8.1 rev. 151003 and Web Forms for Marketers 8.1 rev. 151008.

We have created form, it has create item action and we are trying to add send email message action to save action. But we are getting "This action cannot be added. Your configuration does not support it".

We tried giving smtp configuration also still unable to add action to form. Anybody faced this kind of issue please help.