Using uComponents in Umbraco can sometimes misbehave, this error was given to me in Umbraco 4.9 using uComponents 5.0
The error
Could not find a IDataType control matching DataEditorId 2c787731-cd81-48cd-a94f-4930185bdb58 in the controls collection.
To correct this, check the data type definition in the developer section or ensure that the package/control is installed correctly. This means you are missing a data type from uComponents, in this case the Sub Tabs. This is since Sub Tabs wasn't implemented in 5.0. I use it anyway but that means that I have to do the build myself and put the binaries into the bin folder of umbraco.
