how to solve algebraic loop problem??

in my simulink block to simulate a solar cell, i am getting this error, please help me to solve this: Simulink cannot solve the algebraic loop containing 'entireblock2/(V+IRs)//Rsh' at time 0.0 using the LineSearch-based algorithm due to one of the following reasons: the model is ill-defined i.e., the system equations do not have a solution; or the nonlinear equation solver failed to converge due to numerical issues. To rule out solver convergence as the cause of this error, either a) switch to TrustRegion-based algorithm using set_param('entireblock2','AlgebraicLoopSolver','TrustRegion') b) reducing the VariableStepDiscrete solver RelTol parameter so that the solver takes smaller time steps. If the error persists in spite of the above changes, then the model is likely ill-defined and requires modification

Answer 1

[Chandrasekhar]

add a unit delay block in the feedback path

[Lambros Lambrou]

By using the unit delay then i got nan values... Why?