Por que estou recebendo “ expressão primária esperada antes de '. ' token ”?

Sei que essa é uma pergunta comum, mas a verdade é que cada código é diferente. Às vezes é difícil aplicar o conceito ao seu código, ele não funciona. Então, por favor, me ajude. O que há de errado com este código? Peguei no GitHub. Estou tentando compilá-lo antes de fazer um pouco modificação, ele envia dados de temperatura e umidade para servidores em nuvem ThingSpeak.

#include <DHT.h> // Including library for dht #include <ESP8266WiFi.h> String api_key = "YOUR API KEY"; // Enter your Write API key from ThingSpeak const char *ssid = "YOUR WIFI SSID"; // replace with your wifi ssid and wpa2 key const char *pass = "YOUR WIFI PASSWORD"; const char* server = "api.thingspeak.com"; #define DHTPIN 1 // pin where the dht11 is connected DHT dht; WiFiClient client; void setup() { Serial.begin(115200); delay(10); pinMode(2, OUTPUT); digitalWrite(2, 0); Serial.println("Connecting to "); Serial.println(ssid); WiFi.begin(ssid, pass); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); } void loop() { int chk = DHT.read(DHTPIN); float hum = DHT.humidity; float temp = DHT.temperature; if (isnan(hum) || isnan(temp)) { Serial.println("Failed to read from DHT sensor!"); return; } if (client.connect(server, 80)) { // "184.106.153.149" or api.thingspeak.com String data_to_send = api_key; data_to_send += "&field1="; data_to_send += hum; data_to_send += "&field2="; data_to_send += temp; data_to_send += "\r\n\r\n"; client.print("POST /update HTTP/1.1\n"); client.print("Host: api.thingspeak.com\n"); client.print("Connection: close\n"); client.print("X-THINGSPEAKAPIKEY: " + api_key + "\n"); client.print("Content-Type: application/x-www-form- urlencoded\n"); client.print("Content-Length: "); client.print(data_to_send.length()); client.print("\n\n"); client.print(data_to_send); delay(1000); Serial.print("Temperature: "); Serial.print(temp); Serial.print(" degrees Celcius, Humidity: "); Serial.print(hum); Serial.println("%. Send to Thingspeak."); } client.stop(); Serial.println("Waiting..."); // ThingSpeak needs minimum 15 sec delay between updates, I"ve set it to 30 seconds delay(10000); } 

Quando eu compilo, recebo este erro,

 Arduino: 1.8.10 (Windows 10), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Legacy (new can return nullptr), All SSL ciphers (most compatible), 4MB (FS:2MB OTA:~1019KB), 2, v2 Lower Memory, Disabled, None, Only Sketch, 115200" C:\Users\Agent 96\Desktop\thingspeak\thingspeak.ino: In function "void loop()": thingspeak:37:20: error: expected primary-expression before "." token int chk = DHT.read(DHTPIN); ^ thingspeak:38:22: error: expected primary-expression before "." token float hum = DHT.humidity; ^ thingspeak:39:23: error: expected primary-expression before "." token float temp = DHT.temperature; ^ Multiple libraries were found for "DHT.h" Used: C:\Users\Agent Not used: C:\Users\Agent Multiple libraries were found for "ESP8266WiFi.h" Used: C:\Users\Agent exit status 1 expected primary-expression before "." token This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences. 

Por favor, ajude, sou meio que um iniciante.