Registering a plugin: .FileBasedIndex has unsatisfied dependency

Greeting,

I'm developping a new plugin and following the instructions from http://confluence.jetbrains.net/display/IDEADEV/Developing+Custom+Language+Plugins+for+IntelliJ+IDEA

Right now I am just trying to do the first part of registering the plugin from a brand new plugin project.

My plugin is names Stroll and I have created the following classes:
StrollLanguageFileTypeFactory extends FileTypeFactory
StrollLanguageFileType extends LanguageFileType
StrollLanguage extends Language

Also I have added the following extension point in plugin.xml:
<fileTypeFactory implementation="st.redline.stroll.StrollLanguageFileTypeFactory"/>

I've deployed the plugin and upon restarting IDEA, I get the following error:
2012-05-13 22:21:34,844 [  37806]  ERROR - ij.components.ComponentManager - com.intellij.util.indexing.FileBasedIndex has unsatisfied dependency: class com.intellij.openapi.fileTypes.FileTypeManager among unsatisfiable dependencies: [[class com.intellij.openapi.vfs.ex.VirtualFileManagerEx, class com.intellij.openapi.fileEditor.FileDocumentManager, class com.intellij.openapi.fileTypes.FileTypeManager, interface com.intellij.util.messages.MessageBus, class com.intellij.psi.stubs.SerializationManager]] where AreaPicoContainer.MyPicoContainer[null] was the leaf container being asked for dependencies...

Afterwhich I'm stuck on the splash screen and have to kill the process, remove the plugin from the config/plugin folder and restart IDEA and reenable XPathView+ XLST support.

I'm a complete noob to plugin development so I might be missing or have misread some really basic information.

Thank you for any help