Environment - simulationEnvironment: startTime=6.3936e+06 stopTime=7.1712e+06 tolerance=1e-06 numberOfIntervals=2500 stepSize=311.04 Regular simulation: ./Buildings_latest_Buildings.Air.Systems.SingleZone.VAV.Examples.OptimalStart.ConventionalSpring -abortSlowSimulation -alarm=480 -emit_protected -lv LOG_STATS stdout | warning | The default linear solver fails, the fallback solver with total pivoting is started at time 6393600.000000. That might raise performance issues, for more information use -lv LOG_LS. stdout | warning | The default linear solver fails, the fallback solver with total pivoting is started at time 6393600.000000. That might raise performance issues, for more information use -lv LOG_LS. assert | debug | division leads to inf or nan at time 6.3936e+06, (a=-inf) / (b=2e-07), where divisor b is: 1e-07 + max(zonAHUCon.hvac.totalRes.m_flow, 1e-07) assert | error | Failed to solve the initialization problem with global homotopy with equidistant step size. assert | debug | Unable to solve initialization problem. assert | info | simulation terminated by an assertion at initialization