模仿LED燈程序在arduino IDE 1.6編譯正常，1.8錯誤

錯誤如下：

Arduino:1.8.2 (Windows 10), 開發(fā)板："Arduino/Genuino Uno"

In file included from D:\raduino\webled\webled.ino:9:0:

C:\Users\admin\Documents\Arduino\libraries\aJson/aJSON.h:92:6: error: conflicting return type specified for 'virtual int aJsonStream::flush()'

  int flush();

      ^

In file included from C:\Users\admin\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.19\cores\arduino/Stream.h:26:0,

                 from C:\Users\admin\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.19\cores\arduino/HardwareSerial.h:29,

                 from C:\Users\admin\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.19\cores\arduino/Arduino.h:232,

                 from sketch\webled.ino.cpp:1:

C:\Users\admin\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.19\cores\arduino/Print.h:90:18: error:   overriding 'virtual void Print::flush()'

     virtual void flush() { /* Empty implementation for backward compatibility */ }

                  ^

exit status 1