[EnergyPlus_Support] Severe ** SetComponentFlowRate: trapped plant loop node id = 0

["Jean marais" <jeannieboef@xxxxxxxxx>]

Is this "helpdesk" domain? If not how do I trace it.
The last modification was the "onecircuitpersurface" and the massflowrate max in object ZoneHVAC:LowTemperatureRadiant:VariableFlow.

  ZoneHVAC:LowTemperatureRadiant:VariableFlow,
    118129RADIATIVE_SURF Heat,  !- Name
    HVACTemplate-Always 1,   !- Availability Schedule Name
    118129,                  !- Zone Name
    118129_ExtFloor_13_0_0,  !- Surface Name or Radiant Surface Group Name
    0.012,                   !- Hydronic Tubing Inside Diameter {m}
    autosize,                !- Hydronic Tubing Length {m}
    MeanAirTemperature,      !- Temperature Control Type
    0.00005600,              !- Maximum Hot Water Flow {m3/s}
    118129 RADIATIVE_SURF HW Inlet,  !- Heating Water Inlet Node Name
    118129 RADIATIVE_SURF HW Outlet,  !- Heating Water Outlet Node Name
    0.5,                     !- Heating Control Throttling Range {deltaC}
    RF Supply Temperature,   !- Heating Control Temperature Schedule Name
    ,                        !- Maximum Cold Water Flow {m3/s}
    ,                        !- Cooling Water Inlet Node Name
    ,                        !- Cooling Water Outlet Node Name
    0.5,                     !- Cooling Control Throttling Range {deltaC}
    ,                        !- Cooling Control Temperature Schedule Name
    SimpleOff,               !- Condensation Control Type
    1.0,                     !- Condensation Control Dewpoint Offset {C}
    CalculateFromCircuitLength,           !- Number of Circuits
    20.00;                   !- Circuit Length {m}


****************************************************************

 ************* Testing Individual Branch Integrity
   ************* All Branches passed integrity testing
   ************* Testing Individual Supply Air Path Integrity
   ************* All Supply Air Paths passed integrity testing
   ************* Testing Individual Return Air Path Integrity
   ************* All Return Air Paths passed integrity testing
   ************* No node connection errors were found.
   ************* Beginning Simulation
   ** Severe  ** SetComponentFlowRate: trapped plant loop node id = 0
   ** Severe  ** PsyRhoAirFnPbTdbW: RhoAir (Density of Air) is calculated <= 0 [-13.16313].
   **   ~~~   ** pb =[100900.00], tdb=[-299.73], w=[3.0254150E-003].
   **   ~~~   **  Routine=CorrectZoneHumRat, During Warmup, Environment=KITA, at Simulation time=01/01 04:19 - 04:20
   **  Fatal  ** Program terminates due to preceding condition.
   ...Summary of Errors that led to program termination:
   ..... Reference severe error count=3
   ..... Last severe error=PsyRhoAirFnPbTdbW: RhoAir (Density of Air) is calculated <= 0 [-13.16313].



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