# wglMakeCurrent failed in MakeCurrent after closed a window with two vtk widget.
**URL:** https://discourse.vtk.org/t/wglmakecurrent-failed-in-makecurrent-after-closed-a-window-with-two-vtk-widget/5899
**Category:** Support
**Created:** [June 1, 2021, 12:59pm UTC](https://discourse.vtk.org/t/wglmakecurrent-failed-in-makecurrent-after-closed-a-window-with-two-vtk-widget/5899 "2021-06-01T12:59:20Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)
#### Post date: [June 1, 2021, 12:59pm UTC](https://discourse.vtk.org/t/wglmakecurrent-failed-in-makecurrent-after-closed-a-window-with-two-vtk-widget/5899/1 "2021-06-01T12:59:20Z")
I create a window, in which I add two vtk widget. The window is OK. But, if I close the winodw, a bug is reporeted:
```auto
...
2021-06-01 20:53:09.231 ( 3.482s) []vtkWin32OpenGLRenderWin:217 ERR| vtkWin32OpenGLRenderWindow (000001F8981C0530): wglMakeCurrent failed in MakeCurrent(), error: �������
2021-06-01 20:53:09.275 ( 3.526s) []vtkWin32OpenGLRenderWin:217 ERR| vtkWin32OpenGLRenderWindow (000001F8981C0530): wglMakeCurrent failed in MakeCurrent(), error: �������
2021-06-01 20:53:09.315 ( 3.565s) []vtkWin32OpenGLRenderWin:217 ERR| vtkWin32OpenGLRenderWindow (000001F8981C0530): wglMakeCurrent failed in MakeCurrent(), error: �������
2021-06-01 20:53:09.353 ( 3.603s) []vtkWin32OpenGLRenderWin:217 ERR| vtkWin32OpenGLRenderWindow (000001F8981C0530): wglMakeCurrent failed in MakeCurrent(), error: �������
2021-06-01 20:53:09.388 ( 3.639s) []vtkWin32OpenGLRenderWin:217 ERR| vtkWin32OpenGLRenderWindow (000001F8981C0530): wglMakeCurrent failed in MakeCurrent(), error: �������
2021-06-01 20:53:09.428 ( 3.678s) []vtkWin32OpenGLRenderWin:217 ERR| vtkWin32OpenGLRenderWindow (000001F8981C0530): wglMakeCurrent failed in MakeCurrent(), error: �������
2021-06-01 20:53:09.467 ( 3.717s) []vtkWin32OpenGLRenderWin:90 ERR| vtkWin32OpenGLRenderWindow (000001F8981C0530): wglMakeCurrent failed in Clean(), error: 6
```
The code to reproduce this bug is:
```auto
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
import sys
from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
import vtk
class vtkWin(QWidget):
def __init__ (self):
super(). __init__ ()
layout = QVBoxLayout()
self.setLayout(layout)
self.vtkWidget = QVTKRenderWindowInteractor()
layout.addWidget(self.vtkWidget)
render = vtk.vtkRenderer()
self.vtkWidget.GetRenderWindow().AddRenderer(render)
cone_a=vtk.vtkConeSource()
coneMapper = vtk.vtkPolyDataMapper()
coneMapper.SetInputConnection(cone_a.GetOutputPort())
coneActor = vtk.vtkActor()
coneActor.SetMapper(coneMapper)
render.AddActor(coneActor)
self.vtkWidget.GetRenderWindow().Render()
class MainWindow(QWidget):
def __init__ (self):
super(). __init__ ()
layout = QHBoxLayout()
self.setLayout(layout)
w1 = vtkWin()
w2 = vtkWin()
layout.addWidget(w1)
layout.addWidget(w2)
if __name__ == ' __main__':
app = QApplication(sys.argv)
w = MainWindow()
w.show()
app.exec_()
```
The environment is:
```auto
vtk 9.0.1
PyQt5 5.14.4
```
Any suggestion is appreciated~~~
---
### Author:  [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)
#### Post date: [June 3, 2021, 11:58am UTC](https://discourse.vtk.org/t/wglmakecurrent-failed-in-makecurrent-after-closed-a-window-with-two-vtk-widget/5899/2 "2021-06-03T11:58:58Z")
Finally, I find the solution: we need to manually close the vtk widget
```auto
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
import sys
from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
import vtk
class vtkWin(QWidget):
def __init__ (self):
super(). __init__ ()
layout = QVBoxLayout()
self.setLayout(layout)
self.vtkWidget = QVTKRenderWindowInteractor()
layout.addWidget(self.vtkWidget)
render = vtk.vtkRenderer()
self.vtkWidget.GetRenderWindow().AddRenderer(render)
cone_a=vtk.vtkConeSource()
coneMapper = vtk.vtkPolyDataMapper()
coneMapper.SetInputConnection(cone_a.GetOutputPort())
coneActor = vtk.vtkActor()
coneActor.SetMapper(coneMapper)
render.AddActor(coneActor)
self.vtkWidget.GetRenderWindow().Render()
def closeEvent(self, QCloseEvent):
super().closeEvent(QCloseEvent)
self.vtkWidget.Finalize() ############################ important
class MainWindow(QWidget):
def __init__ (self):
super(). __init__ ()
layout = QHBoxLayout()
self.setLayout(layout)
self.w1 = vtkWin()
self.w2 = vtkWin()
layout.addWidget(self.w1)
layout.addWidget(self.w2)
def closeEvent(self, QCloseEvent):
super().closeEvent(QCloseEvent)
self.w1.close()
self.w2.close()
if __name__ == ' __main__':
app = QApplication(sys.argv)
w = MainWindow()
w.show()
app.exec_()
```