Dear Prof Ray,
I get a warning when running the power flow as below:
What do you think is the solution?

Error using  \ Matrix is singular to working precision.

Error in newtonpf (line 100)
   dx = -(J \ F);

Error in runpf (line 148)
            [V, success, iterations] = newtonpf(Ybus, Sbus, V0, ref, pv, pq, 
mpopt);
RegardsSabhan K

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