private void setUnavailable() {
			FxThreadUtil.run(() -> {
				setOnAction(null);
				textProperty().unbind();
				textProperty().bind(Lang.getBinding("java.parse-state.error"));
				setVisible(true);
			});
		}
Called when a new AST unit was requested, but nothing was returned by the parser.
recaf-ui/src/main/java/software/coley/recaf/ui/control/richtext/source/JavaContextActionSupport.java