MediaWiki API URL error: unable to resolve

[kpdelinger]

I have installed the Scripto plug-in in Omeka 2.5.1, but the MediaWiki API URL that I thought was correct produces an error message when I click “Save Changes” on the Scripto configuration page. I have searched both these forums and the Internet for a solution but found none that worked. I realize that many others before me have had this problem; I apologize in advance if I overlooked the solution. I also thank in advance anyone who can steer me onto the correct path (pun intended).
I am running Omeka locally using MAMP. My Omeka files are therefore in MAMP’s htdocs directory. I have also placed my MediaWiki directory, mediawiki-1.23.15, in htdocs as well. (Note: the MediaWiki directory is not in the Omeka directory, but adjacent to/in the same directory with the Omeka directory. I read elsewhere that putting the MediaWiki directory in the Omeka directory could cause problems. That isn’t the case here.)
I thought, based on the configuration instructions I read, that the correct MediaWiki API URL would be localhost:8888/mediawiki-1.23.15/api.php, but that produces the following error message(s):

Omeka_Plugin_Installer_Exception: Invalid MediaWiki API URL in /Applications/MAMP/htdocs/germanpostcardsproject/plugins/Scripto/ScriptoPlugin.php:235 Stack trace: #0 /Applications/MAMP/htdocs/germanpostcardsproject/application/libraries/Omeka/Plugin/Broker.php(145): ScriptoPlugin->hookConfig(Array) #1 /Applications/MAMP/htdocs/germanpostcardsproject/application/controllers/PluginsController.php(57): Omeka_Plugin_Broker->callHook('config', Array, Object(Plugin)) #2 /Applications/MAMP/htdocs/germanpostcardsproject/application/libraries/Zend/Controller/Action.php(516): PluginsController->configAction() #3 /Applications/MAMP/htdocs/germanpostcardsproject/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('configAction') #4 /Applications/MAMP/htdocs/germanpostcardsproject/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http)) #5 /Applications/MAMP/htdocs/germanpostcardsproject/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch() #6 /Applications/MAMP/htdocs/germanpostcardsproject/application/libraries/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run() #7 /Applications/MAMP/htdocs/germanpostcardsproject/application/libraries/Omeka/Application.php(77): Zend_Application->run() #8 /Applications/MAMP/htdocs/germanpostcardsproject/admin/index.php(28): Omeka_Application->run() #9 {main}

I have tried omitting parts of the URL, among others things, but nothing has worked.
Can anyone point me in the correct direction?

[jimsafley]

That error happens when the client can’t resolve the provided API URL. What happens when you go to http://localhost:8888/mediawiki-1.23.15/api.php in your browser? If that doesn’t work try http://localhost/mediawiki-1.23.15/api.php

[kpdelinger]

Well, this is…embarrassing.
I had typed up a long response to your message, responding to your questions but also noting that technically I hadn’t provided an API URL, because each URL I tried would produce an error message in Omeka when I tried to save that configuration setting.
And then I looked at your response again, noted that the URLs you suggested were complete–that is, they included “http://”, and it dawned on me that I might not have ever included that in any of my attempts.
I appended it to the URL and voila, Omeka saved my configuration settings.
That’s not necessarily what your reply was aiming at, but you helped me nonetheless.
Thank you very much!!