[S5 "Difference between detected height of both PrintCores exceeds realistic values”]

Thank you all, having some progress. The main issue was that the small belts were loose and skipping occasionally. I tightentenm up and I completed the manual and automatic bed leveling and the print started. Since I don't have a calibration card perhaps I got the nozzle too close. Seems like the nozzle was too close to the first layer and swiped it off. The material I am using is ABS and I applied sticky glue for better adhesion, This has worked for a long time so it should be the bed calibration.

[S5 "Difference between detected height of both PrintCores exceeds realistic values”]

I did the tray manual leveling procedure and all other steps more than once but no luck, including calibrating the switch calibration. What is considered the default position of the switch? In what position of the switch should the bed calibration be performed.

[S5 "Difference between detected height of both PrintCores exceeds realistic values”]

I started getting the error "Difference between detected height of both PrintCores exceeds realistic values”  I checked the leveling and as I was doing so I realized that the right B core is really quite significantly protruding below the level of  the left core A. How can I fix this?