Robotframework: RIDE - SikuliLibrary import error

I am working with Robotframework - SikuliLibrary for windows app testing. Everything is installed properly. From RIDE I am importing SikuliLibrary following way _

Library SikuliLibrary click here to see screenshot

If RIDE imports properly then its text color becomes black othertwise red. Sometimes text color is black & sometimes red. Can any one say why?