fixed problem creation

code/src/problems/problembase.cpp

@@ -26,6 +26,7 @@ ProblemBase* ProblemBase::Create( Config* settings, Mesh* mesh ) {
         case PROBLEM_ElectronRT: return new ElectronRT( settings, mesh );
         case PROBLEM_WaterPhantom: return new WaterPhantom( settings, mesh );
         case PROBLEM_LineSource_Pseudo_1D: return new LineSource_SN_Pseudo1D( settings, mesh );
+        case PROBLEM_LineSource_Pseudo_1D_Physics: return new LineSource_SN_Pseudo1D_Physics( settings, mesh );
         default: return new ElectronRT( settings, mesh );    // Use RadioTherapy as dummy
     }
 }