"Please enter a valid GMap macro." error

Issue Summary

I have loaded:

Locations
GMap
GMap Field

I would like to generate a small GMap based on the only Location specified in the node.
I thought GMap Field could do this.

I added the GMap Field to my node.

My settings are as follows:

Required = Unchecked
Number of values = 1

Disable Macro input = Checked (Required)

Add marker = Checked (Required)
Choose marker type = Checked (Required)
Default marker type = "X marks the spot" (Required)

Data source = Use Location(s)

The rest are not supported yet.

I try to edit the node with the location, and ther eis nothing to add (as there shouldn't be).

yet when I try to save the node to hoefully make the connection between the modules, I get a "Please enter a valid GMap macro." error.

Any ideas?