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here we'll take a look at late initialization  error in dart or flusher this is a common error   i'll first go ahead and simulate this problem  so here i am i'm trying to add item to the cart   and then i'm going to place an order and here it  says that late initialization error and it told me   that there is a field or variable its name is user  model and of course i have this variable in my   app so i have to find it now it's easy to find if  you see the log the log will tell you in general   where this variable of course if you wrote to the  app you know where it is but you can also know it   from here like as you can see it's pointing to  user model so you click on this one so here is   the problem now here definitely it says that  this object we created an instance and the   instance would be initialized later so  that's why we have late now if you have   a variable that has a late keyword before it  and before you're going to go ahead and use it   you have to initialize the value for it you have  to give it a value late means you will give it   value later now of course here it's not crashing  actually but this is the variable it's telling you   that this variable you used somewhere else but  you didn't initialize it you just declare it   here we just declared it but we didn't give  it any value and if we look down further uh   here we'll see okay there's another line and  over here we see that user model now this is   the same variable user model this one this is a  getter of user model now i'm using in this class   and here user model i said is not is null okay but  of course it is null but when you take a variable   late you have to make sure that you have some  value for it before you're going to use it   now i'm going to use it over here and i'm  expecting a value null but the variable that is   late it can't be null okay now one of the way to  deal with this one that i remove this one okay now   over here let's see so it raises other problems  over here okay so must be initialized so here   it says that if it's not null then the  user model must be initialized okay   but i can't really initialize it here  for my app architecture so what to do   so most of the time in this kind of situation  you'd put a question mark here what you're telling   that this variable the value this variable value  could be null okay so with this question mark   now for this variable we also have to get use  the getter and getter should also have this   nullable property so this is called...