Error DFRobot EC version 1.0

Can a calibration be reset? I did it like the video with the 1413us/cm solution and I didn't get the same value. I wanted to try again and I realized that the program was asking me for the 12.88 ms/cm solution, and now that I try to calibrate with the 12.88 solution, it gives me a buffer error and tells me to try again.