Cannot Redeclare Smarty_Function_Cycle

Hi,
We came across with an odd situation that you may know how to solve it.
We have the production and testing website on the same server but different folders. The production site works fine but when we open a product in the testing site we get the following error right after the description layer:
Fatal error: Cannot redeclare smarty_function_cycle() (previously declared in /www/app/lib/other/smarty/plugins/function.cycle.php:47) in /www/testing_site/app/lib/other/smarty/plugins/function.cycle.php on line 107
Also mention that the testing site is clone of the other. Same files (except for the config.php and config.local.php) and same dabatase pointing to another location.
Does anybody know why we are getting the Smarty error message only in our testing website.
Thanks for the help

I am guessing you set up testing_site as just another directory instead of a subdomain. If so, the system is not separating the 2.

I am guessing you set up testing_site as just another directory instead of a subdomain. If so, the system is not separating the 2.

Yes, the testing_site is a subdomain and the files are located on the same server. Any idea how to sort this out?

That's all I could think of. If testing_site is setup as a subdomain then it's a server related issue in which you need to contact your host.

Edit: Another thought...I don't think special characters (_) are allowed in domain names so maybe it isn't set up as a subdomain?