Thread:Project:Support desk/Error when trying to watch pages

I'm trying to setup a MediaWiki site and have been playing around with some of the features. I've been trying to get the Watch feature working, but everytime I click on the link in the tab I get the following message:

An error occurred while changing your watchlist settings for.

Would there be something in the configuration that is blocking this feature. Or if anyone has any pointers as to commonly made errors, it would be helpful.