Extracted Variables are not writing into the CSV file using Groovy JSR233 Post Processer

I tried the below Groovy code JSR233 Post Procosser , It's reaching to the file path that I ensured by entering the manual text and it's clearing it, but after that it's not writing the extracted values into the file and doesn't throws any error

// Define the path to the CSV file
def csvFilePath = 'C:/xxxxxxxxxxx/testdata/login_landing_access-token_data.csv'
 // Clear the contents of the CSV file without deleting the header
    def csvFile = new File(csvFilePath)
    if (csvFile.exists()) {
        def csvWriter = new FileWriter(csvFilePath)
        def header = 'captured_access_token,captured_userid,captured_user_emailaddress,captured_login_responsebody\n'
        csvWriter.append(header)
        csvWriter.flush()
        csvWriter.close()
    }
    
    // Write extracted values for the current thread only on the first iteration
    if (ctx.getThreadNum() == 0 && ctx.getVariables().getIteration() == 1) {
        def capturedToken = vars.get('captured_access_token')
        def capturedUserid = vars.get('captured_userid')
        def capturedEmailaddress = vars.get('captured_user_emailaddress')
        def capturedResponseBody = vars.get('captured_login_responsebody')
    
        // Write to CSV file
        def csvWriter = new FileWriter(csvFilePath, true)
        csvWriter.append("${capturedToken},${capturedUserid},${capturedEmailaddress},${capturedResponseBody}\n")
        csvWriter.flush()
        csvWriter.close()
        
       
    }

Also tired the Below code Delete the file & Recreate before Test starts

  try {
    // Define the path to the CSV file
    def csvFilePath = "C:/xxxxxxxxx/testdata/login_landing_access-token_data.csv"

    // Delete the file if it exists
    def csvFile = new File(csvFilePath)
    if (csvFile.exists()) {
        csvFile.delete()
    }

    // Recreate the file if it doesn't exist
    if (!csvFile.exists()) {
        csvFile.createNewFile()
        def csvWriter = new FileWriter(csvFilePath, true)
        csvWriter.append("captured_access_token,captured_userid,captured_user_emailaddress,captured_login_responsebody\n")
        csvWriter.close()
    }

    // Write extracted values including headers for the current thread only on the first iteration
    if (ctx.getThreadNum() == 0 && ctx.getVariables().getIteration() == 1) {
        def capturedToken = vars.get("captured_access_token")
        def capturedUserid = vars.get("captured_userid")
        def capturedEmailaddress = vars.get("captured_user_emailaddress")
        def capturedResponseBody = vars.get("captured_login_responsebody")

        // Write to CSV file
        def csvWriter = new FileWriter(csvFilePath, true)

        csvWriter.append("${capturedToken},${capturedUserid},${capturedEmailaddress},${capturedResponseBody}\n")
        csvWriter.flush() // Flush the writer to ensure the data is written immediately
        csvWriter.close()
    }
} catch (Exception e) {
    log.error("Error occurred while writing to CSV file: ${e.message}")
}

I am able to Write the Extracted values into the CSV successfully using Bean Shell Post Processor