HOW did you rename it? By hand? (Usually extremely Bad) or through the object inspector(Good)? Or with the refactor option ctrl-shift-E(xtremely good)?
What happens here is that the lfm still contains the old name....
If you manually rename, lfm and sourcecode are not synced anymore unless you really know what you are doing, basically do what the good options do behind the scene: synchronize.
To repair, give it back the old name, select it, press ctrl-shift-E, follow the dialog. Or rename from the object inspector, but that will not refactor/rename if the component is used in other units in your project.