haxinglong

I got it too,but I fixed it up. Try copy xtensa-lx106-elf-gdb.exe to "C:\Users\\***\AppData\Local\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2\bin". It works. Arduino IDE ver :1.8.0 OS: win7 X64