Error

Arduino: 1.8.3 (Windows 10), Board: "Arduino/Genuino Uno"

In file included from C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.h:18:0,

                 from C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp:15:

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp: In function 'bool recvRetNumber(uint32_t*, uint32_t)':

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexConfig.h:37:19: error: 'Serial2' was not declared in this scope

 #define nexSerial Serial2

                   ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp:55:5: note: in expansion of macro 'nexSerial'

     nexSerial.setTimeout(timeout);

     ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp: In function 'uint16_t recvRetString(char*, uint16_t, uint32_t)':

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexConfig.h:37:19: error: 'Serial2' was not declared in this scope

 #define nexSerial Serial2

                   ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp:114:16: note: in expansion of macro 'nexSerial'

         while (nexSerial.available())

                ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp: In function 'void sendCommand(const char*)':

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexConfig.h:37:19: error: 'Serial2' was not declared in this scope

 #define nexSerial Serial2

                   ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp:166:12: note: in expansion of macro 'nexSerial'

     while (nexSerial.available())

            ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexConfig.h:37:19: error: 'Serial2' was not declared in this scope

 #define nexSerial Serial2

                   ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp:171:5: note: in expansion of macro 'nexSerial'

     nexSerial.print(cmd);

     ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp: In function 'bool recvRetCommandFinished(uint32_t)':

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexConfig.h:37:19: error: 'Serial2' was not declared in this scope

 #define nexSerial Serial2

                   ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp:192:5: note: in expansion of macro 'nexSerial'

     nexSerial.setTimeout(timeout);

     ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp: In function 'bool nexInit()':

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexConfig.h:37:19: error: 'Serial2' was not declared in this scope

 #define nexSerial Serial2

                   ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp:226:5: note: in expansion of macro 'nexSerial'

     nexSerial.begin(9600);

     ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp: In function 'void nexLoop(NexTouch**)':

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexConfig.h:37:19: error: 'Serial2' was not declared in this scope

 #define nexSerial Serial2

                   ^

C:\Users\User\Documents\Arduino\libraries\ITEADLIB_Arduino_Nextion-master\NexHardware.cpp:242:12: note: in expansion of macro 'nexSerial'

     while (nexSerial.available() > 0)

            ^

exit status 1
Error compiling for board Arduino/Genuino Uno.

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