Fatal Error while in Extension Manager - Joomla! Forum - community, help and support

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i upgraded joomla 1.5. when visit extension manager can install. when choose components, modules, plugins, etc. receive fatal errors:

component, module, plugin template shows: fatal error: call member function getname() on non-object in ....public_html/libraries/joomla/application/component/view.php on line 449

language shows:
warning: require_once(/home/summit/public_html/administrator/components/com_installer/models/extension.php) [function.require-once]: failed open stream: no such file or directory in /home/summit/public_html/administrator/components/com_installer/models/languages.php on line 16

fatal error: require_once() [function.require]: failed opening required '/home/summit/public_html/administrator/components/com_installer/models/extension.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/summit/public_html/administrator/components/com_installer/models/languages.php on line 16

these errors preventing me uninstalling component or module. plus i'm hesitant install new items because wouldn't able subsequently uninstall them.

currently running: joomla! 1.5.8 production/stable

any great. i'm stalled.






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