Rails - Feb 2011 - ERROR : Enclosing class/module 'mMysql2' for class Client not known

hi everybody ,
 i am trying to test a simple webapplication but got the following
error :

molay@molay-VirtualBox:~$ gem install mysql2
Building native extensions.  This could take a while...
Successfully installed mysql2-0.2.6
1 gem installed
Installing ri documentation for mysql2-0.2.6...
Enclosing class/module ''mMysql2'' for class Client not known
Installing RDoc documentation for mysql2-0.2.6...
Enclosing class/module ''mMysql2'' for class Client not known

my data base config is showing the corect info - mysql 2 adapter

any  help ?

thanks

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