Trouble writing data from Arduino Nano ESP32 to a firebase realtime database

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I am working on a project where I need an Arduino Nano ESP32 to send data to a firebase realtime database. I am using mobizt FirebaseClient library and have made sure my database rules are set so that read and write are both true. I have tried various examples in github repos and online tutorials but I am still having trouble getting them to connect. This is what I have right now, I removed the authentication steps for now as I just want to get something working.

#define ENABLE_USER_AUTH
#define ENABLE_DATABASE

#include <WiFi.h>
#include <FirebaseClient.h> 
#include <WiFiClientSecure.h>
#include <time.h> 

// Network and Firebase credentials
#define WIFI_SSID "network ssid"
#define WIFI_PASSWORD "password"

#define API_KEY "api key"
#define DATABASE_URL "url"
#define USER_EMAIL "email"
#define USER_PASS "password"
// This creates the UserAuth object, and the API_KEY is encapsulated within it.
UserAuth user_auth(API_KEY, USER_EMAIL, USER_PASS);

WiFiClientSecure ssl_client1;

using AsyncClient = AsyncClientClass;
AsyncClient async_client1(ssl_client1);

// Initialize Firebase objects
FirebaseApp app; // This acts as the authentication handler
RealtimeDatabase Database; // This handles Realtime Database operations

// Global variable to store the last error message from AsyncClient
String lastClientErrorMessage;

// Callback function for asynchronous operations, including initializeApp and Database.set
void processData(AsyncResult &aResult) {
  if (aResult.isError()) {
    Serial.printf("Error from callback (%s): %s\n", aResult.uid().c_str(), aResult.error().message().c_str());
    lastClientErrorMessage = aResult.error().message(); // Store the error
  } else if (aResult.isEvent()) {
    Serial.printf("Event (%s): %s\n", aResult.uid().c_str(), aResult.appEvent().message().c_str());
  } else if (aResult.isDebug()) {
    Serial.printf("Debug (%s): %s\n", aResult.uid().c_str(), aResult.debug().c_str());
  }
}

// Function to initialize NTP time synchronization
void initTime() {
  Serial.println("Synchronizing time with NTP server...");
  configTime(0, 0, "pool.ntp.org", "time.nist.gov"); // UTC offset 0, DST offset 0

  time_t now = time(nullptr);
  while (now < 1000) { // Wait for time to be set (time_t 0-999 is usually not set)
    delay(500);
    Serial.print(".");
    now = time(nullptr);
  }
  Serial.println("\nTime synchronized.");
  struct tm timeinfo;
  gmtime_r(&now, &timeinfo);
  Serial.printf("Current UTC time: %s", asctime(&timeinfo));
}


void setup() {
  Serial.begin(115200);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

  Serial.print("Connecting to Wi-Fi");
  while (WiFi.status() != WL_CONNECTED)
  {
      Serial.print(".");
      delay(300);
  }
  Serial.println("\nWiFi Connected. IP Address: " + WiFi.localIP().toString());

  ssl_client1.setInsecure();
  ssl_client1.setHandshakeTimeout(5);
  initializeApp(async_client1, app, getAuth(user_auth), processData, "AuthInit");



  Database.url(DATABASE_URL);

  pinMode(A4, INPUT);
}

void loop() {
  app.loop();

  int sensorValue = analogRead(A4);
  Serial.print("Sensor Value: ");
  Serial.println(sensorValue);

  Database.set<int>(async_client1, "/test/lightValue", sensorValue, processData, "SensorWrite");
  Serial.println("Initiated data write to Realtime Database. Check callback for status (UID: SensorWrite).");

  delay(10000);
}

The message that is printed out is

Initiated data write to Realtime Database. Check callback for status (UID: SensorWrite).
Sensor Value: 51
Error from callback (task_2259): app was not assigned

Any help would be greatly appreciated!