Revised I2C Library Error

These are the public methods available in the library that you linked to

public:
  // public methods
  SoftI2CMaster();
  SoftI2CMaster(uint8_t sclPin, uint8_t sdaPin);
  SoftI2CMaster(uint8_t sclPin, uint8_t sdaPin, uint8_t usePullups);

  void setPins(uint8_t sclPin, uint8_t sdaPin, uint8_t usePullups);

  uint8_t beginTransmission(uint8_t address);
  uint8_t beginTransmission(int address);
  uint8_t endTransmission(void);
  uint8_t send(uint8_t);
  void send(uint8_t*, uint8_t);
  void send(int);
  void send(char*);

  uint8_t requestFrom(int address);
  uint8_t requestFrom(uint8_t address);
  uint8_t receive( uint8_t ack );
  uint8_t receive();
  uint8_t receiveLast();