ESP8266 Community Forum

Use Exception decoder and put this error code inside. This tool worked for me and show error inside of an ISR TIMER.

i had the same exception 9 , 28, 29 problem , and still searching until i found the bug. thanks for ALLA,

it was the version of the esp8266 board, that can be changed from ( tools - board manager - 'esp8266' in the search bar - choose then 'esp8266 by esp8266 community' - remove the current version and re-install version 2.5.2

and enjoy then