Getting a error when trying to add my rep in experimental code column

[Eric_Penn]

Here you go… put the Input in A2 the Secret Key in B2 and your Output will go in C2.

function computeHMACSHA1() {
  var sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
  
  // Get the input text from cell A2 and B2
  var inputText = sheet.getRange("A2").getValue();
  var secretKey = sheet.getRange("B2").getValue();
  
  // Convert inputText and secretKey to Base64
  var inputTextBase64 = Utilities.base64Encode(inputText);
  var secretKeyBase64 = Utilities.base64Encode(secretKey);
  
  // Convert Base64 strings back to binary
  var inputBytes = Utilities.base64Decode(inputTextBase64);
  var keyBytes = Utilities.base64Decode(secretKeyBase64);
  
  // Implement HMAC-SHA1 manually
  var blockSize = 64; // HMAC-SHA1 block size
  if (keyBytes.length > blockSize) {
    keyBytes = Utilities.computeDigest(Utilities.DigestAlgorithm.SHA_1, keyBytes);
  }
  
  while (keyBytes.length < blockSize) {
    keyBytes.push(0);
  }
  
  var oKeyPad = [];
  var iKeyPad = [];
  
  for (var i = 0; i < blockSize; i++) {
    oKeyPad.push(keyBytes[i] ^ 0x5C);
    iKeyPad.push(keyBytes[i] ^ 0x36);
  }
  
  var innerHash = Utilities.computeDigest(Utilities.DigestAlgorithm.SHA_1, iKeyPad.concat(inputBytes));
  var finalHash = Utilities.computeDigest(Utilities.DigestAlgorithm.SHA_1, oKeyPad.concat(innerHash));
  
  // Convert the binary hash to a hexadecimal string
  var hmacSha1Hex = '';
  for (var i = 0; i < finalHash.length; i++) {
    var byte = finalHash[i];
    hmacSha1Hex += (byte & 0xFF).toString(16).padStart(2, '0'); // Format as two-digit hex without leading 0's
  }
  
  // Put the result in cell C2
  sheet.getRange("C2").setValue(hmacSha1Hex);
}