Problem with the RichEdit components on OSx

Exception ERangeError in module Demo at 00000001095686C6.
Range check error.
objc[11839]: objc_disposeClassPair: class 'FMXWindow' still has subclasses, including 'NSKVONotifying_FMXWindow'!
objc[11839]: objc_disposeClassPair: class 'FMXWindow' still has subclasses, including 'NSKVONotifying_FMXWindow'!