multiple definition of `HX711::~HX711()'

I have work on Weight Sensor project with HX711. When i upload the code to MEGA board it's shows this error..

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::~HX711()'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::~HX711()'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::~HX711()'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::is_ready()'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::read()'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::set_gain(unsigned char)'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::HX711(unsigned char, unsigned char, unsigned char)'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::HX711(unsigned char, unsigned char, unsigned char)'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::read_average(unsigned char)'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::get_value(unsigned char)'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::get_units(unsigned char)'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::tare(unsigned char)'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::set_scale(float)'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::get_scale()'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::set_offset(long)'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::get_offset()'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::power_down()'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

libraries\HX711-master\HX711.cpp.o (symbol from plugin): In function `HX711::~HX711()':

(.text+0x0): multiple definition of `HX711::power_up()'

sketch\HX711.cpp.o (symbol from plugin):(.text+0x0): first defined here

collect2.exe: error: ld returned 1 exit status

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

What is the library you installed on your card?

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