warning in 130nm IBM cadence

hello! can anyone help me step by step to design an LNA on 130nm IBM on cadence?I am designing for WLAn 11g at 2.4 GHZ and bandwidth is 167MHz.I have reached a cascode stage but getting warning like vgs-vbs is -2.74 exceeds lower limit -2.6.Can somebody suggest the reason of this warning and keep hepling throughout my design?

It's the limit of breakdown voltage of gate oxide, you can find it in design manual