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error.unwrap() is dangerous, it will crash your app, to be safe,
for almost all result or option enum, you should use this syntax
```
let myError: Result<String, Box<dyn error::Error>> = someResultReturningFunction();
if let Err(x) = myError {
// Handle your error here
} else {
// now you can unwrap it, since you are sure its not an error
}
```