ST_Anything and WEMOS D1 mini Board (ESP8266)... HELP!

I am trying to experiment with Wemos D1 mini and ST_Anything as well.
I am following the guideline, but while preparing the Sketch for Wemos it always gives an error during Verification/Compiling:
“SmartThingsESP8266WiFi.h: No such file or directory”

After searching I thought it could be related to not having the right board selected, but I have the ESP8266 boards installed in the Arduino IDE and I can select Wemos D1 R1 or generic ESP8266 Module. But whatever I select, this error message pops up. What am I doing wrong?