Facing an issue while installing the app

[Srimathi622]

Hi,
I was looking for a code editor on a desktop platform(Windows and macOS) then I got your editor. I downloaded this project and tried to install it. I got the below error in fhl.dart file.
var continuation = prevBlock?.mode;
var result =
highlight.parse(text, language: 'cpp' , continuation: continuation
);
block?.mode = result.top;
"The getter 'mode' isn't defined for the type 'Block'.\nTry importing the library that defines 'mode', correcting the name to the name of an existing getter, or defining a getter or field named 'mode'.",

Could you pls help me to get this code editor working?

Thanks in advance