"Got invalid impossible slope calibration!" with G6 and xDrip+, can't calibrate...what to do?

[MM2]

This prior post may help.

Can't calibrate xDrip+ anymore

Sorry for all the posts – I’m still getting used to xDrip and working through issues with it. Today I felt that the readings were off so I calibrated it with BG readings from my Freestyle Lite (the readings were indeed about 25 off), but got this message on xDrip+: “Sensor raw data sanity failure”, and nothing changed with the reading on xDrip. I tried it multiple times and also did the “override calibration” thing, which gave me the same result. I had to do the day before yesterday as well whe…