Exception caught by widgets library null check to xfile to file

Question

When I build after changing Xfile to file, it says null check operator user on a null value, but I don't know what the problem is

The code is too long, so I'll just write the gist

please help me......

XFile? _imageFile; 
File file = File(_imageFile!.path); 

Answer 1

1. Are you picking any file in XFile or just declaring it?
   Then of course you're going to get null value

Otherwise, Add a check when you've picked a file from user

XFile? imageFile;
imageFile = //Your File Picking logic
if(imageFile != null) {
  File _file = File(imageFile!.path);
}

Else you can also try reading the bytes if in any case your file path is inaccessible and create a new file object

imageFile!.readAsBytes();

Answer 2

What does a null check operator?

This operator (!) throws an exception when a nullable variable wasn't initialized (so, it's null).

How do I fix the error?

Since in your code the XFile? _imageFile variable is nullable (indicated by the ?), probably it turns out to be actually null when being assigned to a File object.

A quick solution the null check problem could be this:

late File file;
XFile? _imageFile; 
if (_imageFile != null) {
   file = File(_imageFile!.path);
}

But in your exact code, what you should really do is initialize _imageFile, as right now you are just declaring it.

XFile? _imageFile = await ImagePicker().pickImage(source: ImageSource.gallery); //Example with image_picker package