I was advised that the correct IP path is $IP = "C:\easyphp\www\mediawiki"; and NOT $IP = "/mediawiki";
We have tried every possible path we could think of...
For example, by changing the path to that mentionned above, apart from first error, we also get a list of undefined variables, such as:
Notice: Undefined variable: wgMetaNamespace in
c:\easyphp\www\mediawiki\languages\Language.php on line 25
Notice: Undefined variable: wgMetaNamespace in
c:\easyphp\www\mediawiki\languages\Language.php on line 35
etc...