# TypeError: 'NoneType' object is not callable
**URL:** https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030
**Category:** Support
**Tags:** python, module
**Created:** [January 4, 2023, 2:26pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030 "2023-01-04T14:26:18Z")
**Posts on this page:** 13
**Page:** 1
### Author:  [@LuisaDantas](https://discourse.slicer.org/u/LuisaDantas)
#### Post date: [January 4, 2023, 2:26pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/1 "2023-01-04T14:26:18Z")
Hey all,
I’m developing a module to Slicer and I’m facing some issues. One of the functionalities is to place a control point and get its coordinates through a button that calls a method. I put a `print` on the beggining of this method and it’s called right when I start the module, but when I place de control point and click the button it gives this error: `TypeError: 'NoneType' object is not callable`
```auto
def setup(self):
ScriptedLoadableModuleWidget.setup(self)
uiWidget = slicer.util.loadUI(self.resourcePath('UI/Module.ui'))
self.layout.addWidget(uiWidget)
self.ui = slicer.util.childWidgetVariables(uiWidget)
markupsNode = slicer.mrmlScene.AddNewNodeByClass("vtkMRMLMarkupsFiducialNode")
self.ui.PontoCentralButton.setCurrentNode(markupsNode)
self.ui.PontoCentralButton.buttonsVisible=False
self.ui.PontoCentralButton.placeButton().show()
self.ui.PontoCentralButton.placeMultipleMarkups = slicer.qSlicerMarkupsPlaceWidget.ForcePlaceSingleMarkup
uiWidget.setMRMLScene(slicer.mrmlScene)
# [...]
# Buttons
self.ui.CoordsButton.connect("clicked(bool)", self.logic.coordCentral(self.ui.MRMLNodeComboBox_frame.currentNode(),markupsNode))
```
```auto
def coordCentral(self, inputFrame, markupsNode):
print("method called ")
```
---
### Author:  [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)
#### Post date: [January 4, 2023, 3:17pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/2 "2023-01-04T15:17:24Z")
My guess is that `self.ui.MRMLNodeComboBox_frame` is the NoneType object. Make sure your UI file has this object with this exact objectName of MRMLNodeComboBox\_frame and that you have saved this UI file (not unsaved changes).
---
### Author:  [@LuisaDantas](https://discourse.slicer.org/u/LuisaDantas)
#### Post date: [January 4, 2023, 4:17pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/3 "2023-01-04T16:17:08Z")
Hi James, I checked that but it’s the exact same name. And the .ui file is saved too
---
### Author:  [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)
#### Post date: [January 4, 2023, 5:54pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/4 "2023-01-04T17:54:21Z")
I would suggest you do some continued debugging to find the NoneType object. Adding a print statement for `self.ui.MRMLNodeComboBox_frame` will help confirm if it is indeed an object or a NoneType.
---
### Author:  [@LuisaDantas](https://discourse.slicer.org/u/LuisaDantas)
#### Post date: [January 5, 2023, 12:05pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/5 "2023-01-05T12:05:10Z")
I printed the `inputFrame` on `coordCentral`, where `inputFrame = self.ui.MRMLNodeComboBox_frame` and it returned this:
```auto
vtkMRMLViewNode (000001CC95966B90)
ID: vtkMRMLViewNode1
ClassName: vtkMRMLViewNode
Name: View1
Debug: false
MTime: 227115
Description: (none)
SingletonTag: 1
HideFromEditors: false
Selectable: true
Selected: false
UndoEnabled: false
Attributes:
MappedInLayout:1
Node references:
InteractionNodeRef: (none)
ParentLayoutNodeRef: (none)
LayoutLabel: 1
ViewGroup: 0
Active: 0
Visibility: 1
BackgroundColor: (0.756863, 0.764706, 0.909804)
BackgroundColor2: (0.454902, 0.470588, 0.745098)
LayoutColor: (0.454902, 0.513725, 0.913725)
OrientationMarkerType: none
OrientationMarkerSize: medium
RulerType: none
RulerColor: white
AxisLabels: L;R;P;A;I;S
FieldOfView: 200
LetterSize: 0.05
BoxVisible: true
BoxColor: (1, 0, 1)
FiducialsVisible: true
FiducialLabelsVisible: true
AxisLabelsVisible: true
AxisLabelsCameraDependent: true
AnimationMode: Off
ViewAxisMode: LookFrom
SpinDegrees: 2
AnimationMs: 5
SpinDirection: YawLeft
RotateDegrees: 5
RockLength: 200
RockCount: 0
StereoType: NoStereo
RenderMode: Perspective
UseDepthPeeling: 1
GPUMemorySize: 0
AutoReleaseGraphicsResources: false
ExpectedFPS: 8
VolumeRenderingQuality: 1
RaycastTechnique: 0
VolumeRenderingSurfaceSmoothing: 0
VolumeRenderingOversamplingFactor: 2
Interacting: 0
LinkedControl: 0
```
From `Description: (none)` it seems to be a NoneType right? But again the method was called right when the module started, before selecting the input node and placing the control point. So I’m guessing that’s why it’s NoneType.
Don’t know why this is happening.
---
### Author:  [@cpinter](https://discourse.slicer.org/u/cpinter)
#### Post date: [January 5, 2023, 12:20pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/6 "2023-01-05T12:20:07Z")
Please copy-paste the whole error message you get. Without it it is only possible to keep guessing around.
---
### Author:  [@rbumm](https://discourse.slicer.org/u/rbumm)
#### Post date: [January 5, 2023, 12:35pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/7 "2023-01-05T12:35:35Z")
You seem to be using
```auto
self.ui.PontoCentralButton
```
and
```auto
self.ui.CoordsButton
```
in your example, which will probably not work …
---
### Author:  [@LuisaDantas](https://discourse.slicer.org/u/LuisaDantas)
#### Post date: [January 5, 2023, 12:37pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/8 "2023-01-05T12:37:49Z")
I copied on the original qustion: `TypeError: 'NoneType' object is not callable`
There’s nothing else.
---
### Author:  [@LuisaDantas](https://discourse.slicer.org/u/LuisaDantas)
#### Post date: [January 5, 2023, 12:47pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/9 "2023-01-05T12:47:27Z")
They are different things actually. I don’t know if that’s the most effiecient way because I’m new to Slicer but the idea is: the user place a control point trought the Markups Control Point button (`PontoCentralButton`), and when it’s placed they click on the “Coordenadas” button (`CoordsButton`), wich should call the method and get the coordinates of that control point.
Hope this helps to give more context to the problem.
---
### Author:  [@rbumm](https://discourse.slicer.org/u/rbumm)
#### Post date: [January 5, 2023, 1:20pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/10 "2023-01-05T13:20:39Z")
Please put your function into the YourExtensionWidget class, not into the YourExtensionLogic.
Connect it like:
```auto
self.ui.toggleButton.connect('clicked(bool)', self.onToggleButton)
```
Hope that helps.
---
### Author:  [@LuisaDantas](https://discourse.slicer.org/u/LuisaDantas)
#### Post date: [January 5, 2023, 1:35pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/11 "2023-01-05T13:35:24Z")
Unfortunately the same behavior happens ☹
I made `onToggleButton` call the processing function on the Logic class too, but it didn’t work either.
---
### Author:  [@rbumm](https://discourse.slicer.org/u/rbumm)
#### Post date: [January 5, 2023, 1:55pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/12 "2023-01-05T13:55:15Z")
Maybe you can print the coordinates of your markup [like described here](https://slicer.readthedocs.io/en/latest/developer_guide/script_repository.html#get-volume-voxel-coordinates-from-markup-control-point-ras-coordinates) and avoid passing the view argument.
---
### Author:  [@LuisaDantas](https://discourse.slicer.org/u/LuisaDantas)
#### Post date: [January 5, 2023, 2:14pm UTC](https://discourse.slicer.org/t/typeerror-nonetype-object-is-not-callable/27030/13 "2023-01-05T14:14:46Z")
Great, I’ll try that and let you know if it works, thanks!