Upload error

[TheLazarus89]

Arduino: 1.8.15 (Windows 10), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Disabled (new aborts on oom), Disabled, All SSL ciphers (most compatible), 32KB cache + 32KB IRAM (balanced), Use pgm_read macros for IRAM/PROGMEM, 4MB (FS:2MB OTA:~1019KB), 2, v2 Lower Memory, Disabled, None, Only Sketch, 115200"

remove core\core.a: The process cannot access the file because it is being used by another process.

Error compiling for board NodeMCU 1.0 (ESP-12E Module).

Executable segment sizes:

ICACHE : 32768 - flash instruction cache

IROM : 287860 - code in flash (default or ICACHE_FLASH_ATTR)

IRAM : 30525 / 32768 - code in IRAM (IRAM_ATTR, ISRs...)

DATA : 1696 ) - initialized variables (global, static) in RAM/HEAP

RODATA : 7628 ) / 81920 - constants (global, static) in RAM/HEAP

BSS : 31440 ) - zeroed variables (global, static) in RAM/HEAP

Sketch uses 327709 bytes (31%) of program storage space. Maximum is 1044464 bytes.

Global variables use 40764 bytes (49%) of dynamic memory, leaving 41156 bytes for local variables. Maximum is 81920 bytes.

esptool.py v3.0

Serial port COM1

Connecting......................................____Traceback (most recent call last):

File "C:\Users\Milisavljevic\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/upload.py", line 66, in

esptool.main(cmdline)

File "C:/Users/Milisavljevic/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/3.0.2/tools/esptool\esptool.py", line 3552, in main

esp.connect(args.before, args.connect_attempts)

File "C:/Users/Milisavljevic/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/3.0.2/tools/esptool\esptool.py", line 529, in connect

raise FatalError('Failed to connect to %s: %s' % (self.CHIP_NAME, last_error))

esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header

_

the selected serial port _

does not exist or your board is not connected

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

[https://prnt.sc/1q6laso]

Does someone know what is the problem?

[epiller]

There's either a hardware issue (board malfunction, bad cable, bad port, etc) with the ESP8266 you're using or you need to press the BOOT button on it when plugging it in.

[epiller]

Closing this issue