Hello Dear all, please give me any suggestions. How can i overcome the following error that are in integrator block. Derivative input 1 of 'h_simpleblock/Subsystem/Integrator1' at time 3.155443620884047e-030 is Inf or NaN. Stopping simulation. 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).