How do I solve " solver configuration" problem ?

I made a simple simulink model of a 72-cell PV array and want it to display the IV curve characteristics (PV array is constructed using series combination of solar cells and not by mathematical modelling of Ia, Va and Ipv equations). However, on running the circuit it gives no output and returns the following warning:

"Warning: The model 'solarcellseriesoutput' does not have continuous states, hence Simulink is using the solver 'VariableStepDiscrete' instead of solver 'ode23t'. You can disable this diagnostic by explicitly specifying a discrete solver in the solver tab of the Configuration Parameters dialog, or by setting the 'Automatic solver parameter selection' diagnostic to 'none' in the Diagnostics tab of the Configuration Parameters dialog."

Can anyone suggest a solution (or improvement in the circuit itself) for this? (simulink file is attached)

[Walter Roberson]

The model did not get attached.

[Rb93]

Sorry! It is attached now.