More information about your drone type or flight controller would be very helpful.
You can usually find documentation on what the lights mean in the manual. In my experience, most light issues indicate something that has to do with arming of the drone after you turn it on/plug it in.
Try unplugging it, setting it on a level surface, and then re-plugging it in. leave it still for a few minutes on a level surface after you plug it in so that the gyroscope an accelerometer can calibrate. That might fix it.