Exec Binding does nothing on executeCommandLine code

The Item:
Switch extTest2     "execute Test2"

The Rule:
import org.openhab.core.library.types.*

rule Exec2
when
  Item extTest2 received command
then
  logInfo("extTest2", "extTest2 switch was turned " + receivedCommand.toString)
  if (extTest2.state == ON) {
    executeCommandLine("/home/pi/bin/MCRemote start")
  }
  else {
    executeCommandLine("/home/pi/bin/MCRemote stop")
  }
end