The error is a ReferenceError in JavaScript, indicating an undefined variable or object. In this case, the document object is not defined, possibly due to accessing it before the page has finished loading or outside of a browser environment.
This error is a JavaScript error, specifically a ReferenceError.
It occurs when you try to reference a variable or object that has not been declared or is out of scope.
In this case, the error message is telling you that the document object is not defined, which means you are trying to access the document object before the page has finished loading or outside of a browser environment.