This is the error I see:
Electrical – LTSpice Error: timestep too small
ltspicesimulationvoltage
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Best Answer
Your simulation is, for some reason, too hard for the solver. See this page for some guidance.
Simulators like this use numerical ordinary differential equation (ODE) solvers. Nearly all such solvers adjust the time step dynamically, trying for the largest possible time step while maintaining accuracy. So the time step gets small either when you're doing something that challenges the algorithm (like a stiff system), or when you're asking for too much (like the relative tolerance that @jrive) spoke of.
Things to try are to: