@ mmorisette
At a quick glance it looks like you are referencing fields in you composite locator for the LocatorFieldValues parameter. Despite it's name, I believe that this should be a list of the acceptable locators (not fields) from your composite locator.
The default values when configuring this app are "USA.StreetName", "USA.PointAddress", and "USA.StreetAddress" which are locators referenced by the World Geocode Service
To illustrate this with another locator, the composite locator for Naperville provided in LocalGovernment.gdb references the DualRange, SiteAddress, PlaceName, and StreetName locators also found in LocalGovernment.gdb. If you were to set this app up to reference a geocode service published from this composite locator, any combination of "DualRange", "SiteAddress", "PlaceName", and "StreetName" would be acceptable values for the LocatorFieldValues parameter. Other locators referenced by the composite would not be used.
Allison M
ArcGIS for Local Government