put the full path for the class LumpVolume1

HeatTransfer/BaseClasses/test_LumpVolume.mo

 within TAeZoSysPro_testsuite.HeatTransfer.BaseClasses;
 
 model test_LumpVolume
-  LumpVolume lumpVolume1(T_start = 293.15, energyDynamics = TAeZoSysPro.HeatTransfer.Types.Dynamics.FixedInitial)  annotation(
+  TAeZoSysPro.HeatTransfer.BasesClasses.LumpVolume lumpVolume1(T_start = 293.15, energyDynamics = TAeZoSysPro.HeatTransfer.Types.Dynamics.FixedInitial)  annotation(
     Placement(visible = true, transformation(origin = {0, 50}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));
   TAeZoSysPro.HeatTransfer.BasesClasses.LumpVolume lumpVolume2(energyDynamics = TAeZoSysPro.HeatTransfer.Types.Dynamics.SteadyStateInitial)  annotation(
     Placement(visible = true, transformation(origin = {0, 0}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));