New user fails to be created manually on MeetingBooster. What should I do?

Screening Procedure: When logged in to MeetingBooster, go to Settings icon -> Admin -> User Management -> in User List select Add -> Enter details of new user -> Select Save and an error message appears:

After attempting to create a new user, the system tries to send an email but it fails to send so the system then rolls back the user creation

Solution:  

This error occurs when the application pool identity used for MeetingBooster is incorrect.
Step 1: Ensure that the MeetingBooster directory has the correct Security settings applied to it. Right click MeetingBooster directory -> Properties -> Security -> Check MeetingBooster user exists

Step 2: If this user is not displayed go to Edit -> Add -> Enter iis apppool\MeetingBooster -> select Check Names -> select OK -> Ensure the following permissions are enabled for MeetingBooster as shown in Figure 2 -> Select OK

NOTE: to enter a App pool user – use the syntax: “IIS apppool\MeetingBooster” (here MeetingBooster is the name of the apppool)