Code Error

i purchased rfid reader , pulled servo out of old rc plane.  the goal use servo lock , unlock dorm room door tag. able find code writer make error in line states:

"softwareserial rfid = softwareserial(rxpin,txpin);"

the error reads:
" in function 'void loop()':
error: 'softwareserial' not declared in scope"

i have no clue how declare it.
any help?

#include <softwareserial.h>
http://www.arduino.cc/en/reference/softwareserial

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