Camera Calibration

[msh003]

I have a problem when I want to calibrate the camera. When I entered this command: roslaunch lidar_camera_calibration camera_calibration.launch
The detected squares of the target can be seen in the GUI, and after a while, the CALIBRATE button becomes colorful. When I press the CALIBRATE button on the GUI, the GUI display window becomes clack with purple cross lines.
I want to know whether you had ever faced this problem when you worked with the package or not.