Environment - simulationEnvironment: startTime=1.5984e+07 stopTime=1.67616e+07 tolerance=1e-06 numberOfIntervals=2500 stepSize=311.04 Regular simulation: ./Buildings_9_Buildings.Air.Systems.SingleZone.VAV.Examples.OptimalStart.ConventionalSummer -abortSlowSimulation -alarm=480 -emit_protected -lv LOG_STATS LOG_STDOUT | warning | The default linear solver fails, the fallback solver with total pivoting is started at time 15984000.000000. That might raise performance issues, for more information use -lv LOG_LS. LOG_ASSERT | debug | division by zero at time 15984000, (a=2.95791846399214e-05) / (b=0), where divisor b expression is: max(-zonAHUCon.hvac.out.ports[3].m_flow, 1e-7) - zonAHUCon.sinZonFlo.ports[2].m_flow LOG_ASSERT | error | Failed to solve the initialization problem with global homotopy with equidistant step size. LOG_ASSERT | debug | Unable to solve initialization problem. LOG_ASSERT | info | simulation terminated by an assertion at initialization