Cannot load locator created with ArcGIS Pro in ArcGIS Runtime SDK for WPF app

Question

I created a POI locator using ArcGIS Pro. I have a wpf app and i want to use the created locator in that app.

I am trying to load it using the following code snippet.

string streetMapOSMPath = AppDomain.CurrentDomain.BaseDirectory + "MapTest20200328_2.mmpk";
            string testmmpkPath = AppDomain.CurrentDomain.BaseDirectory + "test20230530.mmpk";
            string locatorPath = AppDomain.CurrentDomain.BaseDirectory + "GIS_test_20230_POI_Locator.loc";
            Uri _serviceUri = new Uri(locatorPath);
            try
            {
                // Load the package
                MobileMapPackage streetMapOSMPackage = await MobileMapPackage.OpenAsync(streetMapOSMPath);
                MobileMapPackage testMapOSMPackage = await MobileMapPackage.OpenAsync(testmmpkPath);

// Load Geocoder
                //_geocoder = testMapOSMPackage.LocatorTask;
                  _geocoder = await LocatorTask.CreateAsync(_serviceUri);
}
            catch (Exception ex)
            {
                // Handle any exception
                System.Windows.MessageBox.Show(ex.Message, "Error opening package");
                return;
            }

I tried mmpk and .loc approaches with no success. i get LoadStatus: FailedToLoad.

Geocoder creation error: file too small to contain valid file header"

Any ideas?

MarkBockenhauer · Accepted Answer

Which version of ArcGIS Pro did you use to create the locator? and which version of the Native Maps SDK are you using?

Then skipping ahead to a potential solution, there is an issue with Pro 3.1 creating locators that do not work in Native Maps SDKs 100.15.   The ArcGIS Pro 3.1.2 patch addresses this issue.