I get the following errors when trying to Verify/Compile. I am trying to use the example sketch without any edits. Any ideas on what to do to fix this problem?
Under additional Board Mangers I have the following.
https://raw.githubusercontent.com/mysensors/ArduinoBoards/master/package_mysensors.org_index.json,http://arduino.esp8266.com/stable/package_esp8266com_index.json
I have MySensors version 2.3.0 installed and have trying using previous versions.

Errors:
In file included from E:*\MySketchesNew\libraries\MySensors/MySensors.h:420:0,
from E:*\MySketchesNew\GatewayESP8266\GatewayESP8266.ino:118:
E:***\MySketchesNew\libraries\MySensors/hal/architecture/ESP8266/MyMainESP8266.cpp:57:53:
error: declaration of C function 'void ets_update_cpu_frequency(int)'
conflicts with extern "C" void ets_update_cpu_frequency(int freqmhz);
In file included from C:\Users*\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.2\cores\esp8266/pgmspace.h:10:0,
from C:\Users*\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.2\cores\esp8266/Arduino.h:256,
from C:\Users*\AppData\Local\Temp\arduino_build_755180\sketch\GatewayESP8266.ino.cpp:1:
C:\Users*\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.2/tools/sdk/include/ets_sys.h:218:6:
error: previous declaration 'void ets_update_cpu_frequency(uint32_t)' here void ets_update_cpu_frequency(uint32_t ticks_per_us);

exit status 1
Error compiling for board NodeMCU 1.0 (ESP-12E Module).

Thank you for the assistance.