If the LED light is constantly green, it likely indicates a hardware issue that is preventing the Barrier from functioning properly until resolved.
This is usually related to either the motor tube or the cover (which contains the solar panel, sensor, etc.).
First, check the cover:
2. Reconnect the white connector that was previously disconnected (as shown in the picture). The easiest way to do this is by using tweezers or a similar tool to carefully guide the connector into place.