Fatal error: Unexpectedly found nil while unwrapping an Optional value — what does it mean and how to fix it?

Hello everyone! I just started learning Swift, and I keep getting this error. I'm writing a simple app — a task list. When I try to read the task name from a text field and add it to an array, the app crashes with the message: Fatal error: Unexpectedly found nil while unwrapping an Optional value Here is my code: ```swift let taskName = textField.text! let newTask = Task(name: taskName) tasks.append(newTask) ``` I understand that textField.text is an optional string (String?), and I'm using the exclamation mark for forced unwrapping. But why does this sometimes lead to an error? I'm sure the user entered text! Maybe the problem is that the textField hasn't loaded yet? Or am I misunderstanding how optionals work? Please explain how to properly handle such situations. I've heard about optional binding and guard let, but I don't understand how they differ and when to use which. The error doesn't always occur, only sometimes — for example, if quickly...