Error fetching casestudy slices for slice-sample

{
  "_errors": [],
  "slices": {
    "0": {
      "_errors": [],
      "_key": {
        "_errors": [
          "Expected never, received string"
        ]
      },
      "type": {
        "_errors": [
          "Expected never, received string",
          "Invalid literal value, expected \"headingCopySlice\"",
          "Invalid literal value, expected \"copyImageSlice\"",
          "Invalid literal value, expected \"copyVideoSlice\"",
          "Invalid literal value, expected \"highlightedH1Slice\"",
          "Invalid literal value, expected \"imageCarouselSlice\"",
          "Invalid literal value, expected \"imageSlice\"",
          "Invalid literal value, expected \"mediaGroupSlice\"",
          "Invalid literal value, expected \"projectListSlice\"",
          "Invalid literal value, expected \"scrollingHeadlineSlice\"",
          "Invalid literal value, expected \"subheadingCopySlice\"",
          "Invalid literal value, expected \"videoSlice\"",
          "Invalid literal value, expected \"linksGroupSlice\""
        ]
      },
      "images": {
        "2": {
          "_errors": [],
          "sanityRawImage": {
            "_errors": [
              "Expected object, received null",
              "Expected object, received null"
            ]
          },
          "url": {
            "_errors": [
              "Required"
            ]
          }
        },
        "_errors": [
          "Expected never, received array"
        ]
      },
      "copy": {
        "_errors": [
          "Required",
          "Required",
          "Required",
          "Required"
        ]
      },
      "image": {
        "_errors": [
          "Required",
          "Required",
          "Required"
        ]
      },
      "headingCopy": {
        "_errors": [
          "Required"
        ]
      },
      "detailsTitleCopy": {
        "_errors": [
          "Required"
        ]
      },
      "detailsContentCopy": {
        "_errors": [
          "Required"
        ]
      },
      "video": {
        "_errors": [
          "Required",
          "Required"
        ]
      },
      "richText": {
        "_errors": [
          "Required"
        ]
      },
      "media": {
        "_errors": [
          "Required"
        ]
      },
      "subheading": {
        "_errors": [
          "Required"
        ]
      },
      "heading": {
        "_errors": [
          "Required"
        ]
      },
      "links": {
        "_errors": [
          "Required"
        ]
      }
    },
    "_errors": []
  }
}