as my circuit is simple just to scale the currents using mirror concept, in the circuit i didn't get any problems 
and also in simulation with 180nm also there is no problems or errors and outputs are also as expected.
but when it comes to 130nm using skywater130nm pdk i have faced a error like "FATUL ERROR"
I did search in the google repeatitively and found out the fallowing things  
why this error:
basically in esim we are using level 8 mosfets but, here we are simulating those using NGSPICE31
but if we see the manual of NGSPICE31 we can't find LEVEL8 MOSFETS there, so i think that is the reason why i got that error
How i have solved it:
i again downaloded ngspice 34
and simulated the modified netlist with NGSPICE34, everything went well.
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way of simulation:
if we run .cir.out file uploaded on ngspice 
we will get currents 20uA 30uA 50uA 70uA from the 10uA.
that is what accepted as per the reference did in literature survay.
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