Adafruit Oled library causing my esp8266 to crash - crash

Question

today I wanted to try to use a oled display with esp8266 using arduino language. Before I always used micropython to use an oled display. I had written a long code but it kept showing error. Then I decided to comment out the code that I used for the oled display. Then the error disappeared. Can someone please help me solve that problem?
My code :
#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>
//netwok
const char* ssid = "Iffaiman";
const char* password = "iffaiman313";
//oled var
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
void setup() {
Serial.begin(115200);
delay(1000);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("Connected to WiFi");
display.println("Hello, world!");
display.display();
}
void loop() {
}
The error message:
xception (28): epc1=0x40201e0a epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000
I tried to remove any optional code but it didn't help.

Answer 1

Your code is crashing because you're not calling the begin() method on the display object. That means it's not initialized, so its behavior is undefined.
You need to call the begin() method before doing anything else with the display.
Serial.println("Connected to WiFi");
if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
Serial.println("Can't find display");
while(1)
yield();
}
display.println("Hello, world!");
display.display();
SCREEN_ADDRESS should be the I2C address of the SSD1306, either 0x3C or 0x3D.
Adafruit publishes extensive examples and tutorials on how to use their products and libraries. These are a very good place to start when you're having problems with the hardware or software.