disabling serialEvent() error in Processing

I am using processing to plot the graph for two sensor's connect to arduino analog pin 0 and 1 and controlling LED at pin 13.
I am using serial data format sensor1_value , sensor2 _value /n

my processing code and arduino code is attched.
While running the code I am getting erroe meaage

Error, disabling serialEvent() for COM2
null

this code works for 1st time after that it keeping showing this error
and also this code works fine for single sensor.

Kindly help me...I am new to processing

processing_1.pde (1.31 KB)

arduino_1.ino (1.13 KB)