Problems installing extensions - Joomla! Forum - community, help and support

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i'm getting started joomla having been wordpress guru past 6 years. i've got setup , working, installed template every time try install extension following error message:

code: select all

fatal error: call protected method jinstallercomponent::_rollback_menu() context 'jinstaller' in /usr/www/users/username/joomla/libraries/joomla/installer/installer.php on line 364


this first happened when installing widgetkit yoothemes, occurs when installing extensions extensions directory, including image resize , phocagallery

i've checked aware of, including directory permissions, no avail.

any ideas how solve this, or can more information?

thanks in advance
tim

should include:

joomla! version - joomla! 3.0.1 stable [ ember ] 09-october-2012 14:00 gmt
joomla! platform version - joomla platform 12.2.0 stable [ neil armstrong ] 21-september-2012 00:00 gmt





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