RFID check

I also tried to use the code below (and others code) but i got errors:

#include "SoftwareSerial.h"


#define txPin 11
#define rxPin 10

SoftwareSerial RFID(rxPin, txPin);

void setup()
{
		Serial.begin(9600);
		RFID.begin(9600);
		pinMode(txPin, OUTPUT); //pin 22
		pinMode(rxPin, INPUT); //pin 24

		Serial.println("Seriport Menu");
		Serial.println("a - Test Menu");
		Serial.println("b - Read card"); 
	 
                Serial.println("");
                delay(2000);   // RFID wait time:
}
 void loop() {
    
   if (Serial.available() > 0) {
      char incomingByte = Serial.read();    
      switch (incomingByte) {
      case 'a':            // if user enters 'a' show test print
      Serial.print("Test menu....");
      break;    
      case 'b':            // if user enters 'b' start card reading
      Serial.print("Card Reading Started");
      RFID.write(0xAB);
      RFID.write(0x02);
      RFID.write(0x02);
      if (RFID.available()>0)
        {
        Serial.print("Card number is:"); 
        Serial.print(RFID.read(), HEX);
        Serial.println(" ");
        }
      break;   
      }
   }
 }

ERRORS

avrdude: stk500v2_command(): unknown status 0xc8
avrdude: initialization failed, rc=-1
         Double check connections and try again, or use -F to override
         this check.

avrdude: stk500v2_command(): unknown status 0x01
avrdude: stk500v2_disable(): failed to leave programming mode