Error on "mode" change

[SergejSi]

When i'm trying to change the "mode" to eg. 'Numeric' or 'Alphanumeric' , i get the following error message:

Does anyone know what the problem could be. The mode "Bytes" works fine

I wanna get the code style like

[AlexandrePhilibert]

You can check this table to see what characters are allowed in each mode : https://en.wikipedia.org/wiki/QR_code#Storage

The Numeric and Alphanumeric modes do not allow the character "h", I am guessing that this is why you get this error