This issue appears to be because ArduinoISP sketch uses a function with the same name as the internal software serial Serial supplied with this core, getch () - this can be fixed easily (find/replace ...
In file included from D:\Users\User\Arduino\libraries\ESP8266WebServer\src/ESP8266WebServer.h:214:0, from D:\Users\User\Arduino\libraries\ESP8266WebServer\src ...
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