Expected unqualified-id before '.' token (DHT11)

[Deltaflyer]

@boxdoge54

#include <Adafruit_Sensor.h>
#include <SPI.h>               //include Serial Peripheral Interface library
#include <Wire.h>              //include Two Wire Interface library
#include <Adafruit_GFX.h>      // include Adafruit graphics library
#include <Adafruit_ST7735.h>   // include Adafruit ST7735 TFT library
#include <Adafruit_BMP280.h>   // include Adafruit BMP280 sensor library
#include "DHT.h"               //include DHTXX sensor library
#define DHTPIN 2               //DHT11 data pin connected to arduino pin D2
#define DHTTYPE DHT11          //specifying the type of DHT sensor used
#define TFT_RST   8            // TFT RST pin is connected to arduino pin D8
#define TFT_CS    10           // TFT CS  pin is connected to arduino pin D9
#define TFT_DC    9            // TFT DC  pin is connected to arduino pin D10
// initialize ST7735 SERIES TFT library
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);

// define device I2C address: 0x76 or 0x77 (0x77 is the library default address)
#define BMP280_I2C_ADDRESS  0x76

Adafruit_BMP280  bmp280;       // initialize Adafruit BMP280 library

DHT dht(DHTPIN, DHTTYPE);     // <-- HERE THE INSTANCEINITIALIZE!!!!

You forgot to initialize an instance for your DHT sensor: see how I inserted the
line 'DHT dht(DHTPIN, DHTTYPE); '^above in the excerpt of your code