How can i solve this problem than stop my simulation all time in my emulation of a variable load for a system supply by batteries.?

Derivative of state '1' in block 'Mec2cea_TODO_Prueba/PV Array/Diode Rsh/BAL/Transfer Fcn' at time 7200.0077705057256 is not finite. The simulation will be stopped. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)