Hi, I am facing this error when open configuration in Dashboard ninja:

SyntaxError: Unexpected token F in JSON at position 0
    at JSON.parse ()
    at Class.init (http://localhost:8069/web/content/329-72f1291/web.assets_backend.js:2478:363)
    at Class.init (http://localhost:8069/web/content/329-72f1291/web.assets_backend.js:2479:328)
    at Class.init (http://localhost:8069/web/content/319-8bc33a0/web.assets_common.js:3864:371)
    at new Class (http://localhost:8069/web/content/319-8bc33a0/web.assets_common.js:3862:65)
    at Class._createViewController (http://localhost:8069/web/content/329-72f1291/web.assets_backend.js:442:658)
    at http://localhost:8069/web/content/329-72f1291/web.assets_backend.js:447:169

How to fix it?