Environment - simulationEnvironment: startTime=6.3936e+06 stopTime=604800 tolerance=1e-06 numberOfIntervals=2500 stepSize=-2315.52 Regular simulation: ./Buildings_9_Buildings.Air.Systems.SingleZone.VAV.Examples.OptimalStart.Guideline36Winter -abortSlowSimulation -alarm=480 -emit_protected -lv LOG_STATS LOG_STDOUT | warning | Integrator step size greater than length of experiment | | info | | start time: 6393600.000000, stop time: 604800.000000, integrator step size: -1157.760000 LOG_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. LOG_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. LOG_ASSERT | debug | division leads to inf or nan at time 6.3936e+06, (a=-nan) / (b=-nan), where divisor b is: 1006.0 * zonAHUG36Con.hvac.heaCoi.sta_a.X[2] + 1860.0 * zonAHUG36Con.hvac.heaCoi.sta_a.X[1] 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