error: The argument type ‘Future‘ can‘t be assigned to the parameter type ‘void Function()‘

Replace

onPressed: Navigator.push(...)

with

onPressed: () => Navigator.push(...)

---

If you need to use await keyword, you can do

onPressed: () async {
  await Navigator.push(...);
  await anyOtherMethod();
}

 @Petro Navigator.push returns a Future and onPressed accepts void, which is why you can't directly assign Navigator.push to onPressed, however when you do onPressed: () => You're simply executing Navigator.push(...) inside the callback provided by onPressed. Hope that explained!

LateError (LateInitializationError: Field '_database@181296932' has not been initialized.)