I have the plugin set up on several different sites and I tried it on both a live web server and my local server (WAMP). It seems to be happening in all places. I also tried disabling all the plugins and setting the Theme to the WordPress default.
I noticed that the add_location function checks for the value of $_POST[‘store-‘] so I added some code that prints out what the value of it is in the error message and it seems to be empty. So it’s like the form is not sending any info to the add_location function.