Uncaught ReferenceError: file is not defined

The error message "Uncaught ReferenceError: file is not defined" typically occurs when you are trying to reference a variable or object called "file" that has not been declared or defined in your code.

To resolve this issue, you need to ensure that you have declared and defined the "file" variable before using it in your code. You can do this by assigning a value to it or declaring it with the `var`, `let`, or `const` keywords. For example:

var file = "example.txt";

Make sure you have properly defined the "file" variable in your code before using it, and the error should be resolved.