The problem you're currently facing is this:
Code:
#include <Whatever.au3>
These < > brackets only work for the UDF path on your system.
Which is
Code:
C:\Program Files (x86)\AutoIt3\Include
on my system.
If you want to include UDFs which are in the same directory, simply use
Code:
#include "Whatever.au3"
If the UDF is not in the same directory try to use the fullpath e.g.
Code:
#include "C:\Users\SampleUser1\Desktop\Whatever.au3"