NodeMCU ESP8266 cannot start

[tranquang7979]

Please help! I'm building a small project that user can control 2 leds through the wifi. After I uploaded program to NodeMCU ESP8266. I got these messages

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Basic Infos

Hardware

Hardware: NodeMCU ESP8266 MOD

Description

Settings in IDE

Sketch

wifi-ESP8266-blink-2leds-socket.zip

[tomamarsanaa]

Hi, I had same problem and I have spent many weeks to try to solve this issue.
At last, I found out the reason. Try to set 16th pin mode in the 'setup' function as below.
Doing this, mine is resolved.

void setup() {
pinMode(16, OUTPUT); // set mode for build in LED which is 16th pin
...
}

[devyte]

GPIOs 6 & 7 are used internally, and shouldn't be used for other purposes. Don't confuse GPIO6 & 7 with D6 & 7.
Please research more about the nodemcu and pinouts.
Closing as user error.