SelectLayerByLocation_management gives ERROR 000368: Invalid input data?

I’m trying to use SelectLayerByLocation_managment in a script and keep getting the following error:

ExecuteError: Failed to execute. Parameters are not valid.
ERROR 000368: Invalid input data.
ERROR 000732: Selecting Features: Dataset pnrsLyr does not exist or is not supported
Failed to execute (SelectLayerByLocation).

I made both feature classes into layers. When I run the same syntax in the Python command window in ArcMap it seems to work fine.

Here’s the script:

import arcpy

cities = r"C:RS_DataPythonGeog485Lesson3Lesson3PracticeExercisesLesson3PracticeExerciseAWashington.gdbCityBoundaries"
pnrs = r"C:RS_DataPythonGeog485Lesson3Lesson3PracticeExercisesLesson3PracticeExerciseAWashington.gdbParkAndRide"

citiesLyr = arcpy.MakeFeatureLayer_management(cities)
pnrsLyr = arcpy.MakeFeatureLayer_management(pnrs)
print "made feature layers"

nameField = "HasParkAndRide"

selection = arcpy.SelectLayerByLocation_management("citiesLyr","INTERSECT","pnrsLyr")