FATAL: The following branches form a loop of rigid branches (short) when added to the circuit

Hey everyone.
I was designing an inductor with varying inductance with spectre. When I try to simulate the test bench, the netlisting stage is completed without errors, but the simulation of the circuit is stopped.
Here is the code and the test bench

The test bench and the code are the following:
Lc (n1 n2) bsource l = max((Lind / (2.0 * cos(0.67 * asin(0.6 * i("Lc:1")/Isw))-1)) * i("Lc:1"), 1e-15), testbench
where Lind and Isw are global parameters. 

Here is the error:

FATAL: The following branches form a loop of rigid branches (short) when added to the circuit:
I0.Lc:ic_br_flow (from net1 to 0)
where net1 is the wire connected to the n1 node.


I used a transient simulation of 100ns. I already added in the view list "spectreText".