While upgrading WordPress website or blog to WordPress 3.0.1 from a earlier version it says “You are not allowed to call this page directly.”
I have noticed so many people facing this issue. Here is the FIX or solution for this issue
Solution to WordPress Upgrading issue
Please try Deactivating your NEXT-GEN Gallery and related plugins of Next Gen Gallery. And then try upgrading your website running on WordPress. I am sure it should work now. Once it is done with upgrading you can activate the NextGen Plugins back.
For Professional WordPress Upgradation from earlier versions to newer versions of WordPress or BuddyPress. Or need any custom WordPress development or designing please do contact me or Request a Quote