SPIFFS nor displaying webserver HTML

PlatformIO IDE
1

I’ve had less success than this with SPIFFS. I’ve tried few things quickie style. But this should work. Browser says 404 error, page not found.
But when I type http://10.0.0.88/index.html, it says page not working:
10.0.0.88 is currently unable to handle this request.
HTTP ERROR 500

I have a data folder with index.html and style.css.

Should this work?

/*********
  Rui Santos
  Complete project details at https://randomnerdtutorials.com  
*********/

// Import required libraries
#include <Arduino.h>
#include "WiFi.h"
#include "ESPAsyncWebServer.h"
#include "SPIFFS.h"

// Replace with your network credentials
const char *ssid = "<wifi ssid>";
const char *password = "<wifi password>";

// Set LED GPIO
const int ledPin = 2;
// Stores LED state
String ledState;

// Create AsyncWebServer object on port 80
AsyncWebServer server(80);

// Replaces placeholder with LED state value
String processor(const String &var)
{
  Serial.println(var);
  if (var == "STATE")
  {
    if (digitalRead(ledPin))
    {
      ledState = "ON";
    }
    else
    {
      ledState = "OFF";
    }
    Serial.print(ledState);
    return ledState;
  }
  return String();
}

void setup()
{
  // Serial port for debugging purposes
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);

  // Initialize SPIFFS
  if (!SPIFFS.begin(true))
  {
    Serial.println("An Error has occurred while mounting SPIFFS");
    return;
  }

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(1000);
    Serial.println("Connecting to WiFi..");
  }

  // Print ESP32 Local IP Address
  Serial.println(WiFi.localIP());

  // Route for root / web page
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) {
    request->send(SPIFFS, "/index.html", String(), false, processor);
  });
  Serial.println("Connecting to WaFa..");

  // Route to load style.css file
  server.on("/style.css", HTTP_GET, [](AsyncWebServerRequest *request) {
    request->send(SPIFFS, "/style.css", "text/css");
  });
  Serial.println("Connecting to WeFe..");

  // Route to set GPIO to HIGH
  server.on("/on", HTTP_GET, [](AsyncWebServerRequest *request) {
    digitalWrite(ledPin, HIGH);
    request->send(SPIFFS, "/index.html", String(), false, processor);
  });
  Serial.println("Connecting to WoFo..");

  // Route to set GPIO to LOW
  server.on("/off", HTTP_GET, [](AsyncWebServerRequest *request) {
    digitalWrite(ledPin, LOW);
    request->send(SPIFFS, "/index.html", String(), false, processor);
  });
  Serial.println("Connecting to WuFu..");

  // Start server
  server.begin();
}

void loop()
{
}
2

Was the filesystem uploaded to the ESP32 via docs?

This is an internal server error… o_O

3

Uploads to ESP32 in /data. The folder disappears. ESP32 tolerates directories, but defaults to flatness.

The implication is that the file is on the chip, but isn’t being displayed.