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Flutter double paint value calculation errors

Getting this error: The setter 'value=' was called on null. Receiver: null Tried calling: value=3000.0 final WallheightController = TextEditingController(); final WalllengthController = TextEditingController(); var height; var length; var area; RxDouble paint = 0.2.obs; RxDouble result=0.0 .obs; calculatepaint() { if (WallheightController.text.isNotEmpty…

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