Downloading and installing the new Arduino IDE for ESP8266

Moderator: igrr

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By mkbutan
#78400 Hi I am using NodeMCU ESP8266 ESP12E
My Arduino IDE is giving the following error
please help
Arduino: 1.8.7 (Windows Store (Windows 10), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, 4M (1M SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 115200"

Sketch uses 268560 bytes (25%) of program storage space. Maximum is 1044464 bytes.
Global variables use 30672 bytes (37%) of dynamic memory, leaving 51248 bytes for local variables. Maximum is 81920 bytes.
error: Failed to open COM3
error: espcomm_open failed
error: espcomm_upload_mem failed
error: espcomm_upload_mem failed

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

please tell me what am i doing wrong?