Index: trunk/MagicSoft/Mars/mhist/MFillH.cc
===================================================================
--- trunk/MagicSoft/Mars/mhist/MFillH.cc	(revision 1471)
+++ trunk/MagicSoft/Mars/mhist/MFillH.cc	(revision 1472)
@@ -89,6 +89,16 @@
     fTitle = title ? title : "Task to fill Mars histograms";
 
-    fH                = NULL;
-    fParContainer     = NULL;
+    fH            = NULL;
+    fParContainer = NULL;
+}
+
+// --------------------------------------------------------------------------
+//
+// Default Constructor. This is to support some root-stuff.
+// Never try to use it yourself!
+//
+MFillH::MFillH()
+{
+    Init(NULL, NULL);
 }
 
Index: trunk/MagicSoft/Mars/mhist/MFillH.h
===================================================================
--- trunk/MagicSoft/Mars/mhist/MFillH.h	(revision 1471)
+++ trunk/MagicSoft/Mars/mhist/MFillH.h	(revision 1472)
@@ -12,8 +12,8 @@
 {
 private:
-    const MParContainer *fParContainer;
+    const MParContainer *fParContainer; //!
     TString fParContainerName;
 
-    MH* fH;
+    MH* fH;                             //!
     TString fHName;
 
@@ -24,4 +24,5 @@
 
 public:
+    MFillH();
     MFillH(const char *hist, const char *par=NULL,     const char *name=NULL, const char *title=NULL);
     MFillH(const char *hist, const MParContainer *par, const char *name=NULL, const char *title=NULL);
@@ -35,5 +36,5 @@
     void SavePrimitive(ofstream &out, Option_t *o="");
 
-    ClassDef(MFillH, 0) // Task to fill a histogram with data from a parameter container
+    ClassDef(MFillH, 1) // Task to fill a histogram with data from a parameter container
 };