Why does my inverter/charger display error code E06?

Why does my inverter read E06?

An E06 Error indicates a possible power demand overload. Check the power consumption of the equipment. Next, unplug all the equipment and plug them back in one piece at a time starting with the equipment with the lowest power consumption to the equipment with the highest power consumption. If problem persists, contact Newcastle tech support. http://www.newcastlesys.com/submit-trouble-ticket