Application Error

Error: GraphQL Error (Code: 520): {"response":{"error":"error code: 520","status":520,"headers":{}},"request":{"query":"\n  query GetMenuList($slug: String) {\n    menus(where: { slug: $slug }) {\n      edges {\n        node {\n          slug\n          name\n          id\n          databaseId\n          menuItems {\n            nodes {\n              url\n              id\n              databaseId\n              label\n              childItems {\n                nodes {\n                  label\n                  uri\n                }\n              }\n              connectedNode {\n                node {\n                  databaseId\n                  ... on Post {\n                    id\n                    databaseId\n                  }\n                }\n              }\n              parentId\n            }\n          }\n          locations\n        }\n      }\n    }\n    generalSettings {\n      title\n      description\n    }\n  }\n","variables":{"slug":"main"}}}
    at functionsWorker-0.39286481751962365.js:7119:64
    at s (functionsWorker-0.39286481751962365.js:6971:17)
    at Object.next (functionsWorker-0.39286481751962365.js:6928:16)
    at u (functionsWorker-0.39286481751962365.js:6900:15)