#lesson 28 Error: Field 'time' should be initialized because its type 'String' doesn't allow null. String time; // the time in that location about flutter-beginners-tutorial

[hanabinoir]

Hope it make sense after two month.

For the latest version of flutter, it requires a late keyword before String type:

late String time;

There are some advanced solutions, but it might be difficult for beginners to rewrite the whole logic:
https://dart.dev/null-safety/understanding-null-safety

[ayowilfred95]

setting String time to late will not fetch the data.
You can create your constructor this way.

World time({required this location, required this.glag, required this.url}):time=' ' ; // Initialize time with empty string.

And that solve the error.
Remember

time = time.now(); //. time has been assigned a function