cacti on AIX 5.3

[AIX5L]

Hello

I wont to run cacti-server on my AIX box.

php poller.php

echo $?
255

There is now output

The module that gives the return code is:
php include/global.php
echo $?
255


but all included script in global.php will return rc=0

php -m
[PHP Modules]
ctype
date
dom
hash
iconv
libxml
pcre
PDO
pdo_sqlite
posix
Reflection
session
SimpleXML
snmp
SPL
SQLite
standard
tokenizer
xml
xmlreader
xmlwriter
zlib

Can anybode help me
How can i run php in debug mode to see where the error is ?
php poller.php --debug gives no output