If you encounter System.NullReferenceException when launching the updated application
(mainly from version <899 or <890 updated to 903 and higher)
This comes from a new syntax in the 'app-settings.json' file
Fix : 
 - rename your app-settings.json in .old file
 - copy app-settings-default.json in app-settings.json
 - open app-settings.json and app-settings.old and copy your parameters manually:
		- LastConfigs
		- LastScripts
		- LastDirectories
		- BoardOnEthernet IP/SN list
		- other specific tuning