Hello All,Got cleared with the previously posted query related to Java code. Now I got the new error while rendering custom navigation component in pages. Attaching the error screenshots.

Tried building a dynamic navigation menu with a Sling Model that maps to the navigation data in AEM. In this, I tried to create a NavigationModel class that retrieves the current page and its siblings, and builds a list of NavigationItem objects that represent each page in the navigation menu.  So w...