When attempting to import a program into another instance, an error occurs, displaying the message of "Unable to import due to field missing".
Solution
In order to address this issue, you should review the program that you are attempting to import, to ensure that you have not only created all fields that are referenced, but also any filter types that are used. If a Smart List filter is used in the program that identifies members of segment, then the segment will also need to be created in the other instance in order for the program to be imported.