Processing and Arduino

I am trying to follow this sparkfun tutorial (, but in the processing part of it when using arduino = new Serial(this, Serial.list()[0], 9600); I get this error:

WARNING:  RXTX Version mismatch
    Jar version = RXTX-2.2pre1
    native lib Version = RXTX-2.2pre2

Could someone instruct me on how to fix this error

You can pretty safely ignore it. It’s common since Processing checks the version of the RXTX library, but the functionality doesn’t change, so all the code works.