Objective-C provided getter does not match requirement's selector about fastimagecache HOT 1 OPEN

@objc(UUID) internal var uuid: String!
    {
        if _UUID == nil
        {
            // MD5 hashing is expensive enough that we only want to do it once
            let imageName: String = sourceImageURL.lastPathComponent
            let UUIDBytes: CFUUIDBytes = FICUUIDBytesFromMD5HashOfString(imageName)
            _UUID = FICStringWithUUIDBytes(UUIDBytes)
        }

        return _UUID;
    }