Error Dialog not found in Dialog table

[JohnMalvey]

I'm just starting with WiX and have this issue with the Error Dialog:

Error WIX0204 ICE20: Specified ErrorDialog: 'ErrorDlg' not found in Dialog table (or its Control_First control is not 'ErrorText').

I have a Property setup: <Property Id="ErrorDialog" Value="ErrorDlg"></Property>

DialogRef is set: <Property Id="ErrorDialog" Value="ErrorDlg"></Property>

And I have a Dialog setup:

    <Control Id="A" Type="PushButton" X="100" Y="80" Width="56" Height="17" TabSkip="yes" Text="Abort">
      <Publish Event="EndDialog" Value="ErrorAbort"></Publish>
    </Control>
    <Control Id="C" Type="PushButton" X="170" Y="80" Width="56" Height="17" TabSkip="no" Text="Cancel">
      <Publish Event="EndDialog" Value="ErrorCancel"></Publish>
    </Control>
    <Control Id="I" Type="PushButton" X="240" Y="80" Width="56" Height="17" TabSkip="yes" Text="Ignore">
      <Publish Event="EndDialog" Value="ErrorIgnore"></Publish>
    </Control>
    <Control Id="N" Type="PushButton" X="310" Y="80" Width="56" Height="17" TabSkip="yes" Text="No">
      <Publish Event="EndDialog" Value="ErrorNo"></Publish>
    </Control>
    <Control Id="O" Type="PushButton" X="380" Y="80" Width="56" Height="17" TabSkip="yes" Text="OK">
      <Publish Event="EndDialog" Value="ErrorOk"></Publish>
    </Control>
    <Control Id="R" Type="PushButton" X="450" Y="80" Width="56" Height="17" TabSkip="yes" Text="Retry">
      <Publish Event="EndDialog" Value="ErrorRetry"></Publish>
    </Control>
    <Control Id="Y" Type="PushButton" X="520" Y="80" Width="56" Height="17" TabSkip="yes" Text="Yes">
      <Publish Event="EndDialog" Value="ErrorYes"></Publish>
    </Control>
  </Dialog>

I'm sure it's something obvious I'm overlooking but not seeing it.

Thanks.