From the traceback, it looks like the default hyperlink style, instead of the footnote hyperlink style, is being used, causing it to attempt to jump to a label titled "1". If this string is occurring in the say screen (as part of regular dialogue), make sure that the line `gui.dialogue_text_hyperlink_functions = (build_base_style, partial(lambda _: None), hover_capture)` is present in the footnotes.rpy file, and that you don't override the value of gui.dialogue_text_hyperlink_functions somewhere else. If this string is occurring in some other context, like a choice screen, make sure the text is given the style attribute `hyperlink_functions (build_base_style, partial(lambda _: None), hover_capture)`. The tag was designed to be used on dialogue shown in the say screen, so it only sets the hyperlink style specific for dialogue text by default.