Cannot open SPIFFS on ESP32 (Arduino): Mounting SPIFFS failed! Error: -1 [closed] - arduino

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I'm building a configuration handler class to ESP32 using Platform IO.
My class has two member functions, as follows:
void WiFiPortal::writeParams(String server, String port, String token)
{
Serial.println("Saving params to filesystem");
DynamicJsonDocument json(1024);
json["mqttServer"] = server;
json["mqttPort"] = port;
json["mqttApiToken"] = token;
File configFile = SPIFFS.open("/config.json", "w");
if (!configFile)
Serial.println("Failed to open config file for writing");
serializeJson(json, Serial);
serializeJson(json, configFile);
configFile.close();
// end save
}
void WiFiPortal::readParams()
{
// read configuration from FS json
Serial.println("Reading parameters");
if (SPIFFS.begin())
{
if (SPIFFS.exists("/config.json"))
{
// file exists, reading and loading
Serial.println("reading config file");
File configFile = SPIFFS.open("/config.json", "r");
if (configFile)
{
Serial.println("opened config file");
DynamicJsonDocument json(1024);
DeserializationError error = deserializeJson(json, configFile);
if (!error)
{
Serial.println("\nParsed json");
String server = json["mqttServer"];
String port = json["mqttPort"];
String token = json["mqttApiToken"];
// Do some stuff with data here
}
else
{
Serial.println("Failed to load json config");
}
configFile.close();
}
}
else
{
Serial.println("Configuration file not found.");
}
}
else
{
Serial.println("Failed to mount filesystem");
}
}
When running, I'm getting the following error at the serial monitor:
Reading parameters
E (155) SPIFFS: mount failed, -10025
[ 161][E][SPIFFS.cpp:89] begin(): Mounting SPIFFS failed! Error: -1
Failed to mount filesystem
Any ideas of what is going on? I'm using a ESP32WROOM32 board.