I have the below error after installing my second site and moving to the component via Components/Multi Sites/Manage Sites.
Any Idea what it might be and how to solve this?

Fatal error: Class 'IT2BE ' not found in C:\path\to\joomla\libraries\joomla\language\language.php on line 171

Thanks, Marcel

Whitout the exact language.php and Joomla version it is difficult to help you.
In Joomla 1.5.9, the line 171 does not correspond to a class definition.

Class IT2BE, seems to be something specific to your when I seen you username that is also 'IT2BE'.
The language.php file is use to give the text related to 'keyword' based on selected language.

There is no Class with name IT2BE that I am aware of.
This just popped up right after installing JMS (v1).
I have Joomla! 1.5.8 Production/Stable [ Wohnaiki ] installed and PHP 5.2.6

Can you be more precised on the condition when this problem occurs.
Does this language error message occurs in Back-end, front-end or both ?
Does this problem occurs for all the extension (component, module, ...) or for only one extension (and which one) ?

If the problem can be seen from the fron-end, can you provide the URL to let us see the behavior.

Can you provide a detailled scenario and conditions that allow to reproduce this issue ?

I also has same problem in my local instalation. so any suggestion about things that i should do /check?

Thank you

Can you give more detailled information.
Which is your version of Joomla ?
Which is the version of JMS ?
Can you provide a detailled scenario on how you reproduce that.
As you have noticed, I have never received any detailled information to try identifiying the reason.
Which is the exact error message because I suppose you don't have an error like class "IT2BE" error.