formName.fieldName.$error.ngRemoteValidate doesn't work

[junerockwell]

I'm using this to validate an email field remotely.

Looking at the console, the HTTP.GET works exactly as it should and returns {"isValid":bool,"value":"someones@email.com"} but my message doesn't show up if isValid is false.

 <span ng-show="userRegistrationForm.email_addr.$error.ngRemoteValidate">
     This email address already exists.
 </span>

And basically, this is what the email field looks like:

<div class="item item-input">

      <span class="input-div">Email</span>
      <input type="email"
             name="email_addr"
             ng-model="userAccountData.email"
             ng-pattern="/^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/"
             ng-remote-validate="http://somewhere.com/api/check_email_existence"
             ng-remote-throttle="400"
             ng-remote-method="GET"
             required>
      <span ng-show="userRegistrationForm.email_addr.$error.ngRemoteValidate">
        This email address already exists.
      </span>
    </div>

Maybe I don't know how to use formName.fieldName.$error.ngRemoteValidate so maybe someone can tell me?

Also, I'm not sure about this but I decided to try and output value of formName.fieldName.$error.ngRemoteValidate doesn't work like this:

<span ng-show="userRegistrationForm.email_addr.$error.ngRemoteValidate">
       {{userRegistrationForm.email_addr.$error.ngRemoteValidate}}
        This email address already exists.
 </span>

...and using FireBug (in Firefox), it doesn't show any value.