error: "<path dir> fatal error #1965: cannot open source file aaa.h"

Hi Lee,
Thanks for the reply, the issue was resolved.
I have an another issue, while I was building it was build fine and generate the xxxxx.lib in the debug. I include this to the "include paths" inside the "Add dir" as like "${workspace_loc:/xxxxx}" and also in the "File Search path" inside "include library file" as like "${workspace_loc:/xxxxx/Debug/xxxxx.lib}" in my main project.
But when I build my main project I was getting error: "<path dir> fatal error #1965: cannot open source file aaa.h" and these are pointing in to "xxxxx" project files. My main is building fine without including this .lib.
So, where is the problem.
I tried by adding pointed source file path "${workspace_loc:/x1/x2}" inside "add dir" of main, its no use. So, again tried by adding the same path along with the header "${workspace_loc:/x1/x2/aaa.h}" inside the "preinclude file" of my main, after this I was getting another same error "<path dir> fatal error #1965: cannot open source file bbb.h". I repeat the same procedure but no use. I am not sure what I tried is correct way or not.
Can you help us to solve our issue.
Regards,
Raghu DS