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opencv and tkinter received an x window system error

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I first developped with eclipse under windows seven and i had no trouble. I then tried to test the code with geany under raspbian jessie of the rasperry pi with the trouble : the program frame received an x window system error here is the code : import cv2 as ocv import tkinter import pygubu class app_root: def __init__(self, master): self.builder = builder = pygubu.Builder() builder.add_from_file("curgent.ui") self.Frame_1 = builder.get_object('Frame_1', master) builder.connect_callbacks(self) def bt_testCam1_click(self): global button button = 1 root.quit() root.destroy() if __name__ == "__main__": global button button = 0 while True: root = tkinter.Tk() app = app_root(root) root.mainloop() if button == 1 : cap = ocv.VideoCapture(0) if(cap.isOpened()): while(cap.isOpened()): ret, the_frame = cap.read() if ret==True: ocv.imshow('frame',the_frame) if (ocv.waitKey(5) != -1): cap.release() ocv.destroyWindow('frame') break else: print("No free Camera") button = 0 Version : - Python 3 - OpenCV 3.0.0 - pygubu: 0.9.7.8 i tested different way without success. Thanks for help or idea

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