[TYPO3] includeLibs not working?

[He Shiming (NOSPAM)]

Hi,

I'm trying to figure out why my external script didn't work.

I have the following TS template setup:
-----------------------------------------------------------------
includeLibs.hsme_string = typo3hsme/hsme_string.php
temp.page-topic = COA
temp.page-topic {
 20 = HTML
 20 {
  value.data = page:title
  postUserFunc = hsme_string->ProcessTitle
}

# of course I'll output it to the page
-----------------------------------------------------------------

The external php script is fairly simple and straightforward, I'm sure it's 
not the problem here. My problem is that the above code has no effect at 
all. "temp.page-topic" contains the exact page:title information, and it 
hasn't been processed by my external function.

As I observe the file system, I found that typo3hsme/hsme_string.php hasn't 
been opened or read. No process even attempted to open this file. I tried 
put a random function name with a random file name here, no error message is 
produced with config.debug = 1.

Why is that? Am I missing something here? Any help will be greatly 
appreciated!

Thanks in advance,
-- 
He Shiming