Scripto installation Invalid MediaWiki API URL

We installed mediawiki on our Omeka server. We have a hosted DotBlock instance.
We are trying to get input the API url for Mediawiki and continue to get an invalid error.
We are inputting http://omeka.wellesley.edu/mediawiki/mediawiki-1.19.2/api.php
This is our Omeka server: http://omeka.wellesley.edu/omeka-1.5.3/
Can anyone give us insight into the problem.
Thanks,

It appears that you've restricted MediaWiki API usage. Scripto requires unrestricted access to the API. See http://www.mediawiki.org/wiki/API:Restricting_API_usage

There is not $wgEnableAPI = false; line in my LocalSettings.php file, but I did find this line
$wgGroupPermissions['*']['read'] = false;
and commented it out and I think we're in business. Thanks for the help!