Simulink Error Singularity Problem

I tried to solve simple differential equation:

dV/dt = (Cr*rho/2*A*V^2)/(m+mx)

where: Cr = 0.45; rho = 1000; A = 0.5; m = 1.2; mx = 0.5;

using Simulink. But it gives me the following error. I tried to change the Solver type and step size but it remains the same. The Simulink model is as attached.

Derivative of state '1' in block 'ASV_simple_model/Integrator1' at time 0.015110895991955593 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)

Please advised. Thank you.