Difficulty assigning GPS coordinates with MAP Panel

[Grasbeak]

I believe that I should be able set GPS coordinates for an image or a selection of images by dropping the images onto the desired location on the Map Panel, or alternately by left clicking on the yellow marker and selecting "Apply this position to all selected files".  I tried that for a set of images (Canon JPG and RAW) and I received the following error:

{
  "error": {
    "code": 1100,
    "message": "Internal error.",
    "details": {
      "result": "failed",
      "errorInfo": "Failed to reverse geo-code the files: \"\"."
    }
  }
}

This occurred rather I tried a single image or a batch of images, it occurred if I tried from the "Media & Folders" window or the "Categories" window, and it occurred whether I tried using the drag and drop method or the left click on the marker approach.  The folder appears to be unlocked - IMatch lock symbol at top of window is open.

I suspect I am making a fairly basic mistake.

I think I have successfully used this functionality in the past (once in ~January).

Can anyone thing of a basic step I may be missing?

Thanks,

[Grasbeak]

I thought I tried also creating a "Location" in the Map Panel in my prior attempts.  I just tried creating a "Location" and the GPS data imported nicely.

Is creating a Location a required step?

[Mario]

You have enabled automatic reverse geocoding (Edit menu > Preferences > Geo & Maps), which is off by default.
For reverse geocoding to function, you have to setup a provider and provide your user name or API key (in the same dialog).
See Geo & Maps for more information.

Either the service you have selected does not work or you have not setup your user name / license key correctly.

Disable automatic reverse geocoding unless you have fixed that and the Map Panel will happily assign coordinates to your images.

It cannot assign coordinates when you force reverse geocoding but reverse geocoding does not work. It's an "atomic" operation. Either it succeeds and the coordinates and location data is assigned, or it fails, leaving the existing coordinates, or no coordinates, unchanged.

[Grasbeak]

Thank you, not just for the correct answer, but for the elaboration.  You were correct, I had enabled reverse geocoding.  I would have never figured that out.    

Brad