Error while simulating the PV array model in MATLAB

dear all

while simulating the model (available at **broken link removed** named pv_ array.mdl) it gives error "Trouble solving algebraic loop containing 'pv_array/PV1/Algebraic Constraint/Initial Guess' at time 0.3100000000000003. Stopping simulation. There may be a singularity in the solution. If the model is correct, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances).". when i modify the panel parameters to the values : Isc = 1.85A, Voc = 21.6, V at Pmax = 17.2V, I at Pmax = 1.75A.

can anyone help me in trouble shooting?

Thanks