Getting problem at white image calibration at 0.9.3 version

[shudha13]

Hello, I am a beginner at this and trying to go through your work as much precisely as possible. I wanted to recreate all your steps with one of your light field image and using your tar file. If i get successful I want to take images with our own plenoptic camera and recreate all the steps to get a clearer image.

I am getting error and can't really understand. Can you please help? adding the error message with this.