Read Array json file uploaded on runner (Postman)

Question

Currently I'm working with writing test script that can read and compare the values return from api and json file I provided. The problem is that I'm not sure the error is in the script or json file.

error returning : JSONError: Unexpected token u in JSON at position 0

json file name (Book1.json)
[
    {
      "name": "Test Case 1",
      "tests": [
        {
          "testName": "Test 1",
          "location": {
            "row": 5,
            "column": 12
          },
          "expectedResult": "1023.00"
        },
        {
          "testName": "Test 2",
          "location": {
            "row": 7,
            "column": 10
          },
          "expectedResult": "500.50"
        }
      ]
    },
    {
      "name": "Test Case 2",
      "tests": [
        {
          "testName": "Test 3",
          "location": {
            "row": 2,
            "column": 8
          },
          "expectedResult": "750.25"
        }
      ]
    }
  ]

Test script :-

const responseJson = pm.response.json();
var data = JSON.parse(responseBody);
var investmentLink = data.result;

// Write a script that can read the JSON file provided and compare the actual and expected results
const jsonData = JSON.parse(pm.iterationData.get("Book1.json"));

// Write a script that can read the JSON file provided and compare the actual and expected results
function performTests(testCase) {
  const tests = testCase.tests;

  tests.forEach((test) => {
    const testName = test.testName;
    const location = test.location;
    const expectedResult = test.expectedResult;
    const row = location.row;
    const column = location.column;

    const actualData = investmentLink.reportPIIllustrationTable[0].illustration[row - 1][`column${column}`].data;
    pm.test(testName, () => {
      pm.expect(actualData).to.equal(expectedResult);
    });
  });
}

jsonData.forEach((testCase) => {
  const testCaseName = testCase.name;
  pm.test(testCaseName, () => {
    performTests(testCase);
  });
});

json file preview

As I look into the error it shows something might wrong with the json file. Someone may help with this issue