Exception caught by widgets library null check to xfile to file - flutter

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

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