correct description of error for invalid state machine arn
correct description of error for invalid state machine arn

spulec/moto,spulec/moto,spulec/moto,william-richard/moto,william-richard/moto,spulec/moto,william-richard/moto,spulec/moto,william-richard/moto,william-richard/moto,spulec/moto,william-richard/moto