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this is my circuit *test ckt

v1 0 1 dc 0 ac 1

a1 1 2 s1

a2 2 3 s2

a3 2 0 s3

.model s1 s_xfer(gain=1 int_ic=[0 0 0] + num_coeff=[4 6 1] + den_coeff=[0 2 0])

.model s3 s_xfer(gain=1 int_ic=[0 0] + num_coeff=[12 1] + den_coeff=[3 0])

.model s2 s_xfer(gain=1 int_ic=[0 0 0 0 0] + num_coeff=[16 66 40 18 8] + den_coeff=[4 16 6 4 1])

.ac oct 0.2 .2 2

.nodeset v(1)=0 v(2)=0 v(3)=0

.end

I am plotting bode plot . But unable to simulate the circuit . getting error "singular matrix error" massage. Am i ok with the circuit? What are the basic thing i will tack care about??

thank you.