Cacti doesn't show graphs after doing a migration

[youmarva]

Hi,

I have migrate my cacti from an old server to a newer one.
My old server is running debian 7 and my new server is running CentOS 6 .

After the migration, all my machines and data have been migrated, but no cacti graph dislpays, and I have this error in the section Console -> Utilities -> View Cacti Log File :

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POLLER: Poller[0] ERROR: The path: is invalid. Can not continue 

Possible Reasons
[*]In the file /etc/cron.d/cacti I have :

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*/5 * * * *	cacti	/usr/bin/php /usr/share/cacti/poller.php > /dev/null 2>&1

But cacti is not a user in this server, it can be the source of this problem ??

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[root@Ces ~]# su cacti
This account is currently not available.

[*]In the old server is installed Cacti Version 0.8.8a and the new server is installed Version 0.8.8b, this can be a problem ?

What is the prblem you think?

Edit:
I'm stuck, if you can help me.
and I'm sorry for my English if there is anything that is not clear in my question let me know.

Thanks
Youmarva

[midir]

Try with Console, utilities, system utilities, rebuild poller cache.

If it doesn't work after some minutes, please copy last lines in cacti log file.