Unable to sync manual switch with the blynk app button

[kausarn3]

Blynk version = 1.0.0
Code used :

`SWITCH_PIN = Pin(13, Pin.IN, Pin.PULL_UP)
RELAY_PIN = Pin(5, Pin.OUT)

blynk = BlynkLib.Blynk(auth_token)
blynk = BlynkLib.Blynk(auth_token)

@blynk.VIRTUAL_WRITE(0)
def v0_write_handler(value):
global relay_state
relay_state = int(value[0])
if relay_state == 1:
RELAY_PIN.on()
else:
RELAY_PIN.off()

def switch_callback(pin):
global relay_state
relay_state = SWITCH_PIN.value()
blynk.virtual_write(0, relay_state) # Update the virtual pin in Blynk
if relay_state == 1:
RELAY_PIN.on()
else:
RELAY_PIN.off()

SWITCH_PIN.irq(trigger=Pin.IRQ_FALLING | Pin.IRQ_RISING, handler=switch_callback)

while True:
blynk.run()`

Error:
File "boot.py", line 26, in
AttributeError: 'Blynk' object has no attribute 'VIRTUAL_WRITE'