@lmtascha this error message usually pops up because the system detects moisture or water in the USB charging port. I would start off with using a blow dryer and see if that will “dry out” the port. Clean the port of any debris since that can generate this error as well. The other thing you can try is to turn off your phone and connect the charger then turn on your phone. It should now charge. Ultimately, it could be moisture/dirt in the charging port, real moisture if you got it wet, a damaged charging port or it could be software related. Start with the easy stuff first. Let us know what you find.