Error message

hi, i have this error message, what can I do?

Build options changed, rebuilding all C:\Program Files (x86)\Arduino\libraries\Heartthrob\PinChangeInterrupt.cpp: In function 'void attachPcInterrupt(uint8_t, void (*)(), uint8_t)':

C:\Program Files (x86)\Arduino\libraries\Heartthrob\PinChangeInterrupt.cpp:76:38: error: 'digitalPinToBitMask' was not declared in this scope

bitMask = digitalPinToBitMask( pin );

^

C:\Program Files (x86)\Arduino\libraries\Heartthrob\PinChangeInterrupt.cpp: In function 'void detachPcInterrupt(uint8_t)':

C:\Program Files (x86)\Arduino\libraries\Heartthrob\PinChangeInterrupt.cpp:266:38: error: 'digitalPinToBitMask' was not declared in this scope

bitMask = digitalPinToBitMask( pin );

^

C:\Program Files (x86)\Arduino\libraries\Heartthrob\PinChangeInterrupt.cpp: In function 'void detachPcInterrupt(uint8_t, void (*)(), uint8_t)':

C:\Program Files (x86)\Arduino\libraries\Heartthrob\PinChangeInterrupt.cpp:315:38: error: 'digitalPinToBitMask' was not declared in this scope

bitMask = digitalPinToBitMask( pin );

^

exit status 1 Error compiling for board ATtiny25/45/85.

hi, i have this error message, what can I do?

may be read about asking a question on the forum and providing meaningful information about your setup?