Cannot connect to X server GOOGLE COLAB

Question

I am trying to make a prediction using Tensorflow Object Detection API on Google COLAB. Already I successfully completed the train

Answer 1

I had the same problem in Colab for a simple OpenCV program to track a tennis ball in a tennis match video and had to comment out these lines, as mentioned by @anand:

#cv2.namedWindow("motion")
#cv2.imshow("motion", img)# モーション画像を表示 

#cv2.destroyAllWindows()

Note: the above lines were not clustered but spread apart.