Error: There is not a system field mapped to the required email field
The error 'There is not a system field mapped to the required email field' occurs when you are trying to import a list.
Symptoms
Importing a list has four steps. At Step 3 you are required to map fields. If your database is restricted, with an Email UID - you must map the Email field.
Resolving the problem
If your database is restricted and requires an email address you must select the field type System and the field Email.