how to get 4-20mA output
While the other answers address the inappropriate choice of op-amp, there is another significant problem.


  instead of n-MOSFET i use CL100 transistor and for p-MOSFET i use CK100  


You can't just do that and expect it to work. If you replace the FETs with BJTs, the op-amp outputs will inject extraneous currents to the signal path via the BJT bases. MOSFET gates are insulated, which is why they were chosen in the first place, as they don't suffer from this.