what is turba ?

[MooD]

After i'm login on imp, i can read my email but i have a warning msg:
<<
Warning: Failed opening
'../lib/../config/../turba/lib/js/open_search_win.js' for inclusion
(include_path='') in ../lib/Registry.php on line 242
>>

What is turba ??
It's obligate to install it for run imp ??

thanks

 
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