Can not ocmpile, getting errir I have not seen before.

[dvukovic]

Hello,
I have tried to compile an example from this library for an ESP-01s. I am getting a set of errors that I have not seen before and am having no success in understanding what to do.
I am using Arduino IDE 2.3.6. I have selected Generic ESP8266 module.
I am seeing dozes of this type of errors:
Compiling sketch...
"C:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\tools\python3\3.7.2-post1/python3" -I "C:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2/tools/signing.py" --mode header --publickey "C:\Users\Inspiron17\Documents\Arduino\libraries\ArduinoOTA\examples\SerialWiFiOTA/public.key" --out "C:\Users\Inspiron17\AppData\Local\arduino\sketches\16503D0DD206C4F969E9DF6BE2235115/core/Updater_Signing.h"
"C:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec/bin/xtensa-lx106-elf-g++" -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ -D_GNU_SOURCE -DESP8266 "@C:\Users\Inspiron17\AppData\Local\arduino\sketches\16503D0DD206C4F969E9DF6BE2235115/core/build.opt" "-IC:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2/tools/sdk/include" "-IC:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2/tools/sdk/lwip2/include" "-IC:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2/tools/sdk/libc/xtensa-lx106-elf/include" "-IC:\Users\Inspiron17\AppData\Local\arduino\sketches\16503D0DD206C4F969E9DF6BE2235115/core" -c "@C:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2/tools/warnings/extra-cppflags" -Os -g -free -fipa-pta -Werror=return-type -mlongcalls -mtext-section-literals -fno-rtti -falign-functions=4 -std=gnu++17 -MMD -ffunction-sections -fdata-sections -fno-exceptions -DMMU_IRAM_SIZE=0x8000 -DMMU_ICACHE_SIZE=0x8000 -DNONOSDK22x_190703=1 -DF_CPU=80000000L -DLWIP_OPEN_SRC -DTCP_MSS=536 -DLWIP_FEATURES=1 -DLWIP_IPV6=0 -DARDUINO=10607 -DARDUINO_ESP8266_GENERIC -DARDUINO_ARCH_ESP8266 "-DARDUINO_BOARD="ESP8266_GENERIC"" "-DARDUINO_BOARD_ID="generic"" -DLED_BUILTIN=2 -DFLASHMODE_DOUT -DF_CRYSTAL=40000000 "-IC:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266" "-IC:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\variants\generic" "-Ic:\Users\Inspiron17\Documents\Arduino\libraries\WiFiEspAT\src" "-IC:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\libraries\ArduinoOTA" "-IC:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\libraries\ESP8266WiFi\src" "-IC:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\libraries\SoftwareSerial\src" "-IC:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\libraries\ESP8266mDNS\src" "C:\Users\Inspiron17\AppData\Local\arduino\sketches\16503D0DD206C4F969E9DF6BE2235115\sketch\SerialWiFiOTA.ino.cpp" -o "C:\Users\Inspiron17\AppData\Local\arduino\sketches\16503D0DD206C4F969E9DF6BE2235115\sketch\SerialWiFiOTA.ino.cpp.o"
In file included from C:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\libraries\ArduinoOTA/ArduinoOTA.h:4,
from C:\Users\Inspiron17\Documents\Arduino\libraries\ArduinoOTA\examples\SerialWiFiOTA\SerialWiFiOTA.ino:16:
C:\Users\Inspiron17\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/wl_definitions.h:51:27: error: 'WL_NO_SHIELD' conflicts with a previous declaration
51 | WL_NO_SHIELD = 255, // for compatibility with WiFi Shield library
| ^~~

I think I understand that there are multiple libraries that share these same definitions. But, I do not know how to find the duplicates.
Anyone seen this error and how did you resolve it.
Thanks

[JAndrassy]

don't use this library with an esp8266