The inverter won't start up unless the safety code has been set correctly, as this governs how the inverter operates in that country.
I'm not sure what your location is, but the safety code needs to be set for that location - here in the UK it is G98 or G99 but it is different throughput Europe.
I'm sorry I don't know the answer to that one, you could contact Foxess support and ask them what is the best setting, or start by using the German safety code VDE ARN4105