How are you setting the contrast on the SerLCD? Are you using an attached Arduino or are you sending commands directly to the ATMega328 on the LCD? You should be able to remove that printout by just sending the "lcd.clear():" command after setting the contrast if you are using the Arduino library. If you are using one of our firmware examples like this serial contrast example, just send the clear display command after setting the contrast and it will clear the message.
I hope this helps you clear that contrast set printout.