Problems with getData()

[ingrocha]

When i call de function getdata() it shows me an error my code its just like the example:

void loop() {
  String data;

  if (client.connected()) {
    data = webSocketClient.getData();

if (data.length() > 0) {
Serial.print("Received data: ");
Serial.println(data);
}

and i get this error:

Arduino:1.8.3 (Windows 8), Tarjeta:"Arduino/Genuino Uno"

G:\Usuario\Documents\Arduino\wesocket\wesocket.ino: In function 'void loop()':

wesocket:90: error: no matching function for call to 'WebSocketClient::getData()'

     data = webSocketClient.getData();

                                    ^

G:\Usuario\Documents\Arduino\wesocket\wesocket.ino:90:36: note: candidates are:

In file included from G:\Usuario\Documents\Arduino\wesocket\wesocket.ino:12:0:

C:\Program Files (x86)\Arduino\libraries\Websocket/WebSocketClient.h:112:10: note: bool WebSocketClient::getData(String&, uint8_t*)

     bool getData(String& data, uint8_t *opcode = NULL);

          ^

C:\Program Files (x86)\Arduino\libraries\Websocket/WebSocketClient.h:112:10: note:   candidate expects 2 arguments, 0 provided

C:\Program Files (x86)\Arduino\libraries\Websocket/WebSocketClient.h:113:7: note: bool WebSocketClient::getData(char*, unsigned int, uint8_t*)

  bool getData(char *data, unsigned int dataLen, uint8_t *opcode = NULL);

       ^

C:\Program Files (x86)\Arduino\libraries\Websocket/WebSocketClient.h:113:7: note:   candidate expects 3 arguments, 0 provided

exit status 1
no matching function for call to 'WebSocketClient::getData()'

Can you help me please!!!