I have a question about " multiple definition "

today I tried to build AT_Command_Parse() which is in the main code in to the library

When I try to compile this I always get an error :

libraries\ZZZ\ATclass.cpp.o: In function `ATclass::~ATclass()’:

C:\Program Files (x86)\arduino-1.6.11\libraries\ZZZ/ATclass.h:251: multiple definition of `b_Mask_SwitchBit39’

sketch\AT_Command_Parse_1.ino.cpp.o:C:\Users\vivi\Desktop\AT_Command_Parse_1/AT_Command_Parse_1.ino:69: first defined here

this is my code could someone help me :sob: :sob: :sob: :sob: :sob:

ATclass.cpp (36.1 KB)

ATclass.h (14 KB)

AT_Command_Parse_1.ino (12.8 KB)