Cannot resolve method 'getElementsByTagName' in 'Document'

The error message "Cannot resolve method 'getElementsByTagName' in 'Document'" usually occurs when you're trying to use the `getElementsByTagName` method on a `Document` object, but the method doesn't exist or is not accessible.

To fix this issue, make sure that you have correctly imported the necessary classes and libraries. The `getElementsByTagName` method is part of the `org.w3c.dom.Document` class, so you need to import it at the beginning of your code:

import org.w3c.dom.Document;

Additionally, ensure that you have obtained a valid `Document` object and that it is not null. You can usually obtain a `Document` object by parsing an XML or HTML document using a parser like DOM or SAX.

If you're still experiencing the issue after following these steps, please provide more details about your code and the context in which you're using the `getElementsByTagName` method, so I can assist you further.