This post could help then: Mesh bed leveling failure X1C
Have you moved your P1S by any chance cause when I did that once, I installed it on a light table and immediately had an error during calibration. I put it on the floor and everything was fine.
Also, check that the 2 screws holding the hotend are tight, one guy had this issue where the unsecured hotend interfered with the values read by the piezo sensors and leveling failed.