Null Check Operator Used in Null Value Error in
The error `NoSuchMethodError: The method 'X' was called on null` occurs when you try to call a method or access a property on a `null` object. It happens because the object you are calling the method on hasn't been initialized yet or is set to `null`.
Solution:
1. Ensure the object is initialized before calling methods on it.
2. Use null-aware operators (`?.`) to safely access properties or methods.
3. If the object can be `null`, use the null-coalescing operator (`??`) to provide default values.
4. Example: `user?.name ?? "Default Name"` ensures no error if `user` is null.
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