Board Thread:Support Requests - Getting Technical/@comment-1140346-20151022100410

Hi! I'm working on some maps for a Wiki and I keep getting the following error message when I try to add a location pin: "Neither of required parameters was provided". Most of the time, canceling the pin and trying again works (without having changed any of the parameters at all). But this one pin is just refusing to work no matter how many times I try to add it. So what does this error mean and how can I prevent it, aside from just redoing the pin (since that doesn't seem to be working in this case)?

Here's a screencap of the error in question:

As you can see, the fields are all filled... so I have no idea what "parameter" could be missing here. 