Voltage source is square pulse alternating between 0 V and 5 V with period of 3 seconds.
I assume you are using the inductors which are ideal I (i.e. from analogLib). For a DC solutions the inductors are replaced by shorts, therefore the simulator can't find a solution because you are shorting your source.
Add a small resistor in series with your voltage source.
As pointed out by Neil_UK another problem is the loop of inductors by itself. Since the current is not determined this leads to another error. So there are actually two problems. Splitting the circuit one gets two error messages.
Fatal error found by spectre during topology check. FATAL: The following branches form a loop of rigid branches (shorts) when added to the circuit: V0:p (from 0 to 0) L2:1 (from net4 to 0)