Cannot access simple hello world component - Joomla! Forum - community, help and support

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hi, i'm newbie joomla.

i'm trying know joomla following hello word component in linkhttp://docs.joomla.org/developing_a_model-view-controller_%28mvc%29_component_for_joomla!2.5_-_part_01%20..
after created "com_hello" inside folder "components" , hello.php same content in tutorial, tested using url "http://localhost/joomla/index.php?option=com_hello" , 404 error page.
i can access other joomla existing component same method cannot "com_hellp"

can guy give me advice this. have google cannot find anything

your component not register joomla! yet. need go "extension manager" => "discover" => click "discover" , should able see component there. select , click "install".





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