PID.h needed even though I've included it

I recently starting exploring the option of using the Labwindows PID toolbox instead of my own out of interests sake. I ran some examples fine. When I implemented it in my own application I've included the following header files

#include <windows.h>
#include "PID.h"
#include <utility.h>
#include "asynctmr.h"
#include <udpsupp.h>
#include <ansi_c.h>
#include <formatio.h>
#include <cvintwrk.h>
#include <userint.h>
#include <rtutil.h>
#include <errno.h>

Even though I've included PID.h it gives an error

The following include statements are needed in "myfile.c".

        #include "PID.h"

Do you want to add them after the include statement for windows.h?

I've obviously included it but wonder if I don't have something set up correctly in my environment. I should also note this is being run on a Real-Time Target. The seemingly unnecessary included headers are there because I have a file that is compiled in both windows and LVRT and handled with #if _LINK_CVI_LVRT_ directives.

I provided the activation key earlier yesterday and have rebooted the system. I can run the examples just fine. Any thoughts or ideas?