in the device MC1541TT (IC5) the GND pin direction is set to "output". Please set it to "passive":
open library "microchip.lbr"
look for device "MC15*". open it
check what symbol is used for it ("INFO" and mouse click on the symbol)
open this symbolwithin the library editor
press "change direction passive" and [enter]
mouse click on the "VSS" pin
save library
go back to schematic
update library "microchip"
save
run ERC.