firstly its not the oil light.its the fi light and it lights on when something is " wrong " in ecu readings.you may have overheating ,it may be an injection issue,maybe the l sensor on the muffler reads wrong,maybe its the battery,maybe its the thermostat in the coolant circuit.you should visit the dealer to check the fi .
by installing the crashbars i cant figure out how the fi light could be triggered in any way.
maybe accidentally you unpluged the O2 sensor on the airbox,or the exhaust sensor?
go inspect the engine carefully,unscrew the rear fairings to see if any electrical plug is off.
then go to the deal,thats my advice