What is the error in my circuit in Simulink?
This is a very abstract error... "Series RLC Branch 1"  "Series RLC Branch"  you have 6 RLC branches in this model with labels disabled (for those not familiar with SimPowerSystems, RLC is the primative, you choose the combination)

Looking at the diagram there does not appear to be any GROUND reference. This helps the "circuit" reference nodes. Not only that, you can then provide a 1Mohm to GROUND from the low side of the transformer to help the simulator resolve nodal voltages.


Put an EARTH node on the low side of the AC source
Put a 1Mohm resistor from the secondary XFMR to EARTH


if this fails please provide the simulink file so I may diagnose this end.