Error compiling for board Arduino/Genuino Mega or Mega 2560

Development Tools IDE 1.x
1

hello!

recently i joined an arduino summerschool. the first day i was working on one of their computers and it worked just fine. the next day i decided to bring my recently bought laptop (hp omen if that helps) and then the issues came up. for the first 2 programs everything as working perfectly fine like on the summer school computer but then it started popping up message "error compiling for board Arduino/Genuino Mega of Mega 2560" i was really confused and so was the teacher. i really hope i can get help. im using arduino 1.8.5

error message:

Arduino:1.8.5 (Windows 10), Plošča:"Arduino/Genuino Mega or Mega 2560, ATmega2560 (Mega 2560)"

In file included from C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/Arduino.h:32:0,

                 from sketch\motor_test.ino.cpp:1:

C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/binary.h:31:12: error: expected unqualified-id before numeric constant

 #define B1 1

            ^

C:\Users\38640\Desktop\arduino folder\motor_test\motor_test.ino:9:5: note: in expansion of macro 'B1'

 int B1=2;

     ^

exit status 1
Error compiling for board Arduino/Genuino Mega or Mega 2560.

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2

B1 is a macro defined in the Arduino core library, intended to make it easier to work with binary numbers. You're trying to use that name for your variable at line 5 of your sketch. You need to use a different variable name. Use a descriptive variable name. "B1" doesn't really mean anything.

3

Conflict with the variable B1 and macro B1. Use different name for the variable.