...
This error message will be displayed to the Confluence admin users of the Confluence if the configuration loaded is not valid. This issue could be caused mostly if some a user with admin permissions has manually modified the JSON stored in on the “Navigation Configuration“ page. If the change made here has broken the JSON structure, then SubSpace will not use this configuration and will show the warning instead.
...
An admin user should find the space called “Communardo Products“ with the key “COMMUNARDOPRODUCTS“. Inside this page it should be a page called “Navigation Configuration“. Edit this page and find the “Page properties“ macro with the id “subspace-navigation“. Copy the text in the macro and follow the steps below:
...